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Journal articles on the topic 'Bassin de San Juan'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Johnson, Samuel Y., Robert A. Zimmermann, Charles W. Naeser, and John T. Whetten. "Fission-track dating of the tectonic development of the San Juan Islands, Washington." Canadian Journal of Earth Sciences 23, no. 9 (September 1, 1986): 1318–30. http://dx.doi.org/10.1139/e86-127.

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The San Juan Islands of Washington State form a geologically complex province located between the north Cascades, Vancouver Island, and the Olympic Peninsula. We have obtained 53 fission-track dates from the San Juan Islands province that help constrain its late Paleozoic to early Cenozoic tectonic and sedimentary history and its relationship to neighboring geologic terranes. The San Juan Islands can be divided into two main blocks separated by the Haro fault. South of the Haro fault, complexly deformed, metamorphosed, and probably exotic early Paleozoic to early Late Cretaceous rocks form four imbricate thrust plates separated by south- and east-dipping late Early to Late Cretaceous thrust faults. Reset zircon fission-track dates indicate that thrusting may have produced an upside-down geothermal gradient in the uppermost plate, the Decatur terrane. If present, this gradient was probably produced by conductive or frictional heating associated with a now-eroded overlying thrust fault and hot thrust plate. Cretaceous thrusting in the southern San Juan Islands was accompanied by uplift and resetting of apatite fission-track dates. In contrast to correlative rocks of the southern San Juan Islands, Upper Triassic to Lower Cretaceous rocks in and north of the Haro fault zone are essentially unmetamorphosed and only broadly folded. Apatite dates from the Upper Triassic Haro Formation and the Upper Jurassic and Lower Cretaceous Spieden Group indicate they did not participate in Late Cretaceous uplift of the southern San Juan Islands. Together with their basement (the Wrangellia terrane?), these rocks probably acted as a backstop to thrusting. The synorogenic Late Cretaceous Nanaimo basin formed north of the Haro fault in front of the advancing San Juan Islands thrust system. The age of Nanaimo deposition matches uplift (apatite) dates in the southern San Juan Islands, and detrital zircons from the Nanaimo Group yield dates consistent with southern San Juan Islands sources. Burial led to resetting of apatite dates in what is probably the deeper part of the Nanaimo basin.

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2

Wosik, Mateusz, and Merrilee F. Guenther. "Examination of a historic collection of isolated cranial and appendicular hadrosaurid material from the lower Kirtland Formation of the San Juan Basin, New Mexico." Journal of Paleontology 90, no. 4 (July 2016): 763–70. http://dx.doi.org/10.1017/jpa.2016.75.

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AbstractThe Field Museum of Natural History collection contains several isolated hadrosaurid specimens collected by Charles H. Sternberg from the lower Kirtland Formation of the San Juan Basin, New Mexico, that have been previously overlooked. Cranial elements described herein consist of a dentary and three jugals while appendicular material is limited to two humeri and two pubes. Many of the specimens preserve taxonomically informative characters that show strong affinities with Kritosaurini but are distinct from Kritosaurus navajovius (Brown, 1910) suggesting that the saurolophine-dominated San Juan Basin diversity is greater than currently recognized. Future examination of currently unprepared material will add to our developing understanding of the ambiguous hadrosaurid diversity of the San Juan Basin.

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3

Cather, Steven M., Matthew T. Heizler, and Thomas E. Williamson. "Laramide fluvial evolution of the San Juan Basin, New Mexico and Colorado: Paleocurrent and detrital-sanidine age constraints from the Paleocene Nacimiento and Animas formations." Geosphere 15, no. 5 (August 14, 2019): 1641–64. http://dx.doi.org/10.1130/ges02072.1.

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Abstract Understanding the tectonic and landscape evolution of the Colorado Plateau−southern Rocky Mountains area requires knowledge of the Laramide stratigraphic development of the San Juan Basin. Laramide sediment-transport vectors within the San Juan Basin are relatively well understood, except for those of the Nacimiento and Animas formations. Throughout most of the San Juan Basin of northwestern New Mexico and adjacent Colorado, these Paleocene units are mudstone-dominated fluvial successions intercalated between the lowermost Paleocene Kimbeto Member of the Ojo Alamo Sandstone and the basal strata of the lower Eocene San Jose Formation, both sandstone-dominated fluvial deposits. For the Nacimiento and Animas formations, we present a new lithostratigraphy that provides a basis for basin-scale interpretation of the Paleocene fluvial architecture using facies analysis, paleocurrent measurements, and 40Ar/ 39Ar sanidine age data. In contrast to the dominantly southerly or southeasterly paleoflow exhibited by the underlying Kimbeto Member and the overlying San Jose Formation, the Nacimiento and Animas formations exhibit evidence of diverse paleoflow. In the southern and western part of the basin during the Puercan, the lower part of the Nacimiento Formation was deposited by south- or southeast-flowing streams, similar to those of the underlying Kimbeto Member. This pattern of southeasterly paleoflow continued during the Torrejonian in the western part of the basin, within a southeast-prograding distributive fluvial system. By Torrejonian time, a major east-northeast–flowing fluvial system, herein termed the Tsosie paleoriver, had entered the southwestern part of the basin, and a switch to northerly paleoflow had occurred in the southern San Juan Basin. The reversal of paleoslope in the southern part of the San Juan Basin probably resulted from rapid subsidence in the northeast part of the basin during the early Paleocene. Continued Tiffanian-age southeastward progradation of the distributive fluvial system that headed in the western part of the basin pushed the Tsosie paleoriver beyond the present outcrop extent of the basin. In the eastern and northern parts of the San Juan Basin, paleoflow was generally toward the south throughout deposition of the Nacimiento and the Animas formations. An important exception is a newly discovered paleodrainage that exited the northeastern part of the basin, ∼15 km south of Dulce, New Mexico. There, an ∼130-m-thick Paleocene sandstone (herein informally termed the Wirt member of the Animas Formation) records a major east-flowing paleoriver system that aggraded within a broad paleovalley carved deeply into the Upper Cretaceous Lewis Shale. 40Ar/ 39Ar dating of detrital sanidine documents a maximum depositional age of 65.58 ± 0.10 Ma for the Wirt member. The detrital sanidine grains are indistinguishable in age and K/Ca values from sanidines of the Horseshoe ash (65.49 ± 0.06 Ma), which is exposed 10.5 m above the base of the Nacimiento Formation in the southwestern part of the basin. The Wirt member may represent the deposits of the Tsosie paleoriver where it exited eastward from the basin. Our study shows that the evolution of Paleocene fluvial systems in the San Juan Basin was complex and primarily responded to variations in subsidence-related sedimentary accommodation within the basin.

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4

Meehan, T. J., and Robert W. Wilson. "New viverravids from the Torrejonian (Middle Paleocene) of Kutz Canyon, New Mexico and the oldest skull of the order Carnivora." Journal of Paleontology 76, no. 6 (November 2002): 1091–101. http://dx.doi.org/10.1017/s0022336000057899.

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Three new species of Viverravidae (Carnivora: Miacoidea) are described: Protictis simpsoni, P. minor, and Bryanictis paulus. Holotypes and referred specimens are from the Angel Peak area, Kutz Canyon, San Juan Basin, New Mexico and are of middle Torrejonian age (middle Paleocene). The holotype of Protictis simpsoni includes a skull—the oldest known skull of the Order Carnivora. The locality is narrowly restricted stratigraphically and geographically, and specimens are better preserved than most other viverravid specimens of San Juan Basin strata.

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5

Nelson, Walter W., and Stephen A. Sonnenberg. "Sequence stratigraphy and regional context of the Mancos-Niobrara in the northern San Juan Basin." Mountain Geologist 58, no. 2 (April 1, 2021): 105–57. http://dx.doi.org/10.31582/rmag.mg.58.2.105.

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In the northern San Juan Basin, the Niobrara Formation is represented by the upper half of the Mancos Shale (the Smoky Hill Member and Cortez Member). This section is generally equivalent to the Niobrara Formation along the Colorado Front Range. Although the Fort Hays Limestone is absent west of Pagosa Springs, the C Chalk and B Chalk are well-expressed as two resistant bench-forming calcareous units in the northern San Juan Basin. These two calcareous units have also been established as prospective hydrocarbon targets by operators in the area. Calcareous facies equivalent to the A Chalk were not deposited in the northern San Juan Basin due to siliciclastic dilution during the regressive latter half of the Niobrara marine cycle. The overall third-order Niobrara marine cycle includes these members of the Mancos Shale: the Juana Lopez, Montezuma Valley, Smoky Hill, and Cortez members. The Smoky Hill Member sits just above the basal Niobrara unconformity in most of the study area, and the entire section also has greater thickness and siliciclastic content than its equivalent farther east along the Front Range. Several extensive outcrop locations (in and around Pagosa Springs, Piedra, and Durango, CO) along with three new cores along the CO-NM border form the foundation for sequence stratigraphic interpretation of the Niobrara marine cycle in this study. All these locations and cores were tied back to the Mancos reference section at Mesa Verde National Park established by Leckie et al. (1997) which provides detailed description and biostratigraphy for the entire Mancos Shale. Establishing and applying a sequence stratigraphic framework to any section creates consistent reference standards for communication, research, and further correlation. Comparisons of chemostratigraphic data from equivalent strata between the northern San Juan Basin and Denver-Julesburg (DJ) Basin reveal significant differences in the timing and style of source-rock deposition (and associated low-oxygen conditions). The sequence stratigraphic framework also emphasizes tremendous lateral facies changes in the basal Niobrara section (i.e., Fort Hays Limestone to Tocito Sandstone). Once refined and applied, this stratigraphic framework can be used for predicting the distribution of reservoir properties, in addition to enhancing understanding of the Niobrara marine cycle and the Western Interior Seaway.

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6

Lucas, Spencer G., Thomas E. Williamson, and Michael D. Middleton. "Catopsalis (Mammalia: Multituberculata) from the Paleocene of New Mexico and Utah: Taxonomy and biochronological significance." Journal of Paleontology 71, no. 3 (May 1997): 484–93. http://dx.doi.org/10.1017/s0022336000039500.

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Recently collected specimens of Catopsalis fissidens from the Torrejonian interval of the Nacimiento Formation in the San Juan Basin, New Mexico significantly augment knowledge of the morphology and dental variability of the species. This new knowledge suggests C. foliatus Cope, 1882 (=C. johnstoni Fox, 1989) is a valid Puercan species and that C. fissidens Cope, 1884a is a subjective senior synonym of C. utahensis Gazin, 1939. This latter synonymy further increases taxa shared between the Dragon Canyon local fauna of Utah and the Torrejonian fauna of the San Juan Basin, thus supporting previous inclusion of the Dragonian land-mammal “age” in the Torrejonian.

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7

Hart, Bruce. "Stratigraphy and hydrocarbon resources of the San Juan Basin: Lessons for other basins, lessons from other basins." Mountain Geologist 58, no. 2 (April 1, 2021): 43–103. http://dx.doi.org/10.31582/rmag.mg.58.2.43.

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This paper examines the relationships between stratigraphy and hydrocarbon production from the San Juan Basin of New Mexico and Colorado. Abundant data and the long production history allow lessons to be learned, both from an exploration and development perspective, that can be applied in other basins. Conversely, as new play types and technologies are defined and developed elsewhere, the applicability of those tools in the San Juan Basin needs to be understood for well-informed exploration and development activities to continue. The San Juan Basin is a Latest Cretaceous – Tertiary (Paleogene) structure that contains rocks deposited from the Lower Paleozoic to the Tertiary, but only the Upper Cretaceous section has significant hydrocarbon, mostly gas, production. Herein I make the case for studying depositional systems, and the controls thereon (e.g., basin development, eustasy, sediment supply), because they are the first-order controls on whether a sedimentary basin can become a hydrocarbon province, or super basin as the San Juan Basin has recently been defined. Only in the Upper Cretaceous did a suitable combination of forcing mechanisms combine to form source and reservoir rocks, and repeated transgressive-regressive cycles of the Upper Cretaceous stacked multiple successions of source and reservoir rocks in a way that leads to stacked pay potential. Because of the types of depositional systems that could develop, the source rocks were primarily gas prone, like those of other Rocky Mountain basins. Oil-prone source rocks are present but primarily restricted to episodes of peak transgression. A lack of suitable trapping mechanisms helps to explain the relative dearth of conventional oil pools. Although gas production has dropped precipitously in the past decade, driven primarily by overabundance of gas supply associated with the shale-gas boom, the combination of horizontal drilling and multi-stage hydraulic fracturing is being applied to revive oil production from some unconventional stratigraphic targets with success.

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8

Simmons, Nancy B. "A revision of Taeniolabis (Mammalia: Multituberculata), with a new species from the Puercan of eastern Montana." Journal of Paleontology 61, no. 4 (July 1987): 794–808. http://dx.doi.org/10.1017/s0022336000029140.

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The largest known member of the mammalian order Multituberculata is the taeniolabidid Taeniolabis, which is known from Puercan (early Paleocene) localities in northern New Mexico, Utah, Montana, and southern Saskatchewan. A locality in the Ludlow Formation of southeastern Montana has produced remains of a new species, T. lamberti n. sp., which is based on a well-preserved dentary with teeth. Isolated teeth from the Tullock Formation of northeastern Montana are referred to T. lamberti n. sp. and Taeniolabis sp.Taeniolabis triserialis, known exclusively from the San Juan Basin, New Mexico, is shown to be a junior synonym of T. taoensis. Taeniolabis sulcatus, the type species of the genus, is recognized as a nomen dubium and is synonymized with T. taoensis based on general morphology and occurrence in the same stratigraphic unit and collecting area (lower part of the Nacimiento Formation, San Juan Basin, New Mexico). The name T. taoensis is retained for this taxon in the interest of nomenclatorial stability. These synonymies limit to one the number of species of Taeniolabis recognized in the San Juan Basin, New Mexico. It is proposed that T. taoensis be designated the new type species of the genus Taeniolabis.

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9

Garita-Alvarado, Carlos A., and Claudia Patricia Ornelas-García. "Parallel Evolution of Allometric Trajectories of Trophic Morphology between Sympatric Morphs of Mesoamerican Astyanax (Characidae)." Applied Sciences 11, no. 17 (August 30, 2021): 8020. http://dx.doi.org/10.3390/app11178020.

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Parallel evolution of the body shape and trophic-related traits has been detected between sympatric pairs of lake-dwelling characin fishes in Mesoamerica. Here, we evaluated the variation in and the ontogenetic allometric trajectories of trophic morphology between sympatric Astyanax morphs (elongate and deep-body) in two geographic systems, Lake Catemaco (Mexico) and San Juan River basin (Nicaragua and Costa Rica). Using geometric morphometrics, we determined the shape variation and disparity in the premaxillary bone, and the patterns of allometric trajectories between morphs in each system. We found a higher differentiation and disparity in the premaxilla shape between morphs from San Juan River basin than between the Lake Catemaco ones. We found shared (parallel evolution) patterns of divergence between systems, which included allometric trajectories showing a positive correlation between the premaxilla shape and log centroid size, as well as trajectories being extended in the elongated-body morph (truncated in the deep-body morph). Regarding the unique patterns of divergence, we recovered parallel allometric trajectories between morphs from Lake Catemaco, while the San Juan River basin morphs showed divergent trajectories. Our results are congruent with the hypothesis that divergence in trophic morphology can be considered a triggering factor in the divergence in the genus Astyanax from Mesoamerica.

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10

Clarkson, Gerry, and Marshall Reiter. "The thermal regime of the San Juan basin since late cretaceous times and its relationship to San Juan mountains thermal sources." Journal of Volcanology and Geothermal Research 31, no. 3-4 (April 1987): 217–37. http://dx.doi.org/10.1016/0377-0273(87)90069-2.

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11

Bybee, Karen. "Pilot Capillary Surfactant-Injection System in the San Juan Basin." Journal of Petroleum Technology 58, no. 05 (May 1, 2006): 62–65. http://dx.doi.org/10.2118/0506-0062-jpt.

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12

Arzate, J. A., R. E. Chávez, and J. Rodríguez. "Magnetic interpretation of the San Juan Londó Basin, BCS, Mexico." Geofísica Internacional 29, no. 1 (January 1, 1990): 19–27. http://dx.doi.org/10.22201/igeof.00167169p.1990.29.1.615.

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La cuenca de agua subterránea de San Juan Londó está situada al norte de La Paz, Baja California. Se efectuó una prospección magnética terrestre para definir la geometría y los limites estructurales de la cuenca. En un total de 173 estaciones se hicieron mediciones magnéticas corregidas, tomando en cuenta la variación diurna y el campo geomagnético. Los datos fueron interpolados en una red de espacios iguales, de 256 km2. Se aplico un análisis de Fourier para efectuar una separación regional-residual mediante un diseño adecuado de filtros de paso alto y bajo, combinado con una reducción al polo de los datos magnéticos para centrar las anomalías sobre los cuerpos que las generan. La interpretación sugiere que el valle está dividido en tres principales subcuencas separadas por una deformación de tipo horst.

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13

Lucas, Spencer G., and Robert M. Sullivan. "A new crocodilian from the Upper Cretaceous of the San Juan Basin, New Mexico." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 2003, no. 2 (March 10, 2003): 109–19. http://dx.doi.org/10.1127/njgpm/2003/2003/109.

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14

Garver, John. "Stratigraphy, depositional setting, and tectonic significance of the clastic cover to the Fidalgo Ophiolite, San Juan Islands, Washington." Canadian Journal of Earth Sciences 25, no. 3 (March 1, 1988): 417–32. http://dx.doi.org/10.1139/e88-043.

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The San Juan Islands of northwest Washington State comprise a diverse assemblage of Paleozoic and Mesozoic terranes amalgamated during a regional Cretaceous orogenic event. Detailed tectono-stratigraphy of the sedimentary cover to the Fidalgo Complex indicates the presence of several stratigraphically distinct units, which are described and formalized in this paper. The Fidalgo Complex and its sedimentary cover are the structurally highest rocks in the San Juan thrust system.The Fidalgo Complex is a highly disrupted Middle to Upper Jurassic ophiolite with arc-related intrusives, volcanics, and sediments. The Trump unit is an informally named sequence of siliceous sediments, volcanic graywacke, and minor volcanics that occurs at the stratigraphically highest portion of the Fidalgo Complex. Complex facies, lithologies, and provenance indicate that deposition of this Oxfordian(?) to upper Tithonian unit occurred in an arc-proximal setting.The upper Tithonian and younger Lummi Group (elevated here) lies depositionally above the Fidalgo Complex; locally the contact is an angular unconformity. The James Island Formation (new) is designated as a lower unit of the Lummi Group in the Decatur Island area. The chert-rich volcaniclastic sediments of the James Island Formation, locally containing ophiolitic debris, represent submarine-fan deposition within a tectonically active basin where basement blocks were uplifted along fault scarps.Middle Cretaceous thrusting and lawsonite–prehnite–aragonite metamorphism predated deposition of the Obstruction Formation (new), which is inferred to unconformably overlie the Lummi Group – Fidalgo Complex. Metamorphism postdated the late Albian, as rocks of this age are metamorphosed. The Obstruction Formation (?Cenomanian–Turonian) does not have metamorphic lawsonite–prehnite–aragonite, which are characteristic of underlying terranes in the San Juan Islands. Instead, the Obstruction Formation contains clasts derived from underlying metamorphosed terranes in the San Juan Islands; some clasts show these high-pressure, low-temperature metamorphic minerals. The Obstruction Formation probably represents synthrusting sedimentation that occurred after the San Juan terranes were metamorphosed and rapidly brought to the surface by continued thrusting over a hanging-wall obstruction. Thrusting was most likely driven by the accretion of Wrangellia against the North American margin.

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15

Miller, W. P., T. C. Piechota, S. Gangopadhyay, and T. Pruitt. "Development of streamflow projections under changing climate conditions over Colorado River Basin headwaters." Hydrology and Earth System Sciences Discussions 7, no. 4 (August 12, 2010): 5577–619. http://dx.doi.org/10.5194/hessd-7-5577-2010.

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Abstract. The current drought over the Colorado River Basin has raised concerns that the US Department of the Interior, Bureau of Reclamation (Reclamation) may impose water shortages over the lower portion of the basin for the first time in history. The guidelines that determine levels of shortage are affected by forecasts determined by the Colorado Basin River Forecast Center (CBRFC). While these forecasts by the CBRFC are useful, water managers within the basin are interested in long-term projections of streamflow, particularly under changing climate conditions. In this study, a bias-corrected, statistically downscaled dataset of projected climate is used to force a hydrologic model utilized by the CBRFC to derive projections of streamflow over the Green, Gunnison, and San Juan River headwater basins located within the Colorado River Basin. This study evaluates the impact of changing climate to evapotranspiration rates. The impact to evapotranspiration rates is taken into consideration and incorporated into the development of streamflow projections over Colorado River headwater basins in this study. Additionally, the CBRFC hydrologic model is modified to account for impacts to evapotranspiration due to changing temperature over the basin. Adjusting evapotranspiration demands over the Gunnison resulted in a 6% to 13% average decrease in runoff over the Gunnison River Basin when compared to static evapotranspiration rates. Streamflow projections derived using projections of future climate and the CBRFC's hydrologic model resulted in decreased runoff in 2 of the 3 basins considered. Over the Gunnison and San Juan River basins, a 10% to 15% average decrease in basin runoff is projected through the year 2099. However, over the Green River basin, a 5% to 8% increase in basin runoff is projected through 2099. Evidence of nonstationary behavior is apparent over the Gunnison and San Juan River basins.

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16

Mavor, M. J., and J. E. Vaughn. "Increasing Coal Absolute Permeability in the San Juan Basin Fruitland Formation." SPE Reservoir Evaluation & Engineering 1, no. 03 (June 1, 1998): 201–6. http://dx.doi.org/10.2118/39105-pa.

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Summary Recently measured data show that the absolute permeability of coal natural fracture is increasing significantly with continued gas production in the San Juan basin Fruitland formation. This phenomenon caused gas-production rates to be many times greater than expected from early production history. The phenomenon also caused producing bottomhole pressures to increase when gas rates were constant, opposite from that expected from conventional applications of Darcy's law. The increase in absolute permeability caused by gas desorption has been measured on cores, but, until recently, there was no verification that this phenomenon occurs in situ. Palmer and Mansoori (P&M) presented a new theory and showed how this theory matched gas- and water-production rates and estimated bottomhole-pressure data for a high-deliverability San Juan basin Fruitland formation coal-gas well. However, Palmer and Mansoori had no transient pressure data to support in-situ permeability changes. This paper documents data from drill stem tests (DST's) and shut-in tests with analyses there of and additional production-rate and pressure behaviors that support the P&M theory. The well-test data were measured in three wells completed in the San Juan basin Fruitland formation coal seams located under the Valencia Canyon (VC) area. These wells, VC 29-4, VC 32-1, and VC 32-4, are located in Sections 29 and 32, T33N, RllW, La Plata County, Colorado, and operated by EnerVest San Juan Operating LLC. In addition to the well-test data, EnerVest and the Gas Research Inst. (GRI) collected extensive formation-evaluation data and performed detailed analyses that allowed a thorough description of the area. Although there are other wells operated by EnerVest in the area, well-test data were not available from the other wells to determine the absolute permeability estimates; therefore, these wells are not discussed in this paper. The P&M theory was calibrated with well-test-derived absolute permeability estimates and published coal-shrinkage data. Reservoir simulation models, based on the calibrated theory, matched the unusual producing, bottomhole-pressure behavior. Without the P&M theory it was not possible to match pressure behavior or permeability estimates with reasonable variations of reservoir properties input into the reservoir-simulation models. The remainder of this paper summarizes the well-test analysis results from the three wells and, for brevity, one set of well-test data and one simulation study. The well-test data and simulation studies for the other wells were similar to the examples.

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17

Reynolds, John G., and Alan K. Burnham. "Pyrolysis kinetics and maturation of coals from the San Juan basin." Energy & Fuels 7, no. 5 (September 1993): 610–19. http://dx.doi.org/10.1021/ef00041a008.

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18

Cordell, Linda. ": The Chacoan Prehistory of the San Juan Basin . R. Gwinn Vivian." American Anthropologist 93, no. 4 (December 1991): 988–89. http://dx.doi.org/10.1525/aa.1991.93.4.02a00520.

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19

McCaffery, Harlan, Robert H. Tykot, Kathy Durand Gore, and Beau R. DeBoer. "Stable Isotope Analysis of Turkey (Meleagriscc Gallopavo) Diet from Pueblo II and Pueblo III Sites, Middle San Juan Region, Northwest New Mexico." American Antiquity 79, no. 2 (April 2014): 337–52. http://dx.doi.org/10.7183/0002-7316.79.2.337.

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AbstractThe transition from the Pueblo 11 Period (A.D. 1050–1150) to the Pueblo III Period (A.D. 1150–1300) in the San Juan Basin marks an intensification of turkey use, evidenced by an increase in the percentage of faunal assemblages representing turkey bones. We examine stable carbon (δ13C) and nitrogen ( δ15N) isotopic values of turkey bones from three ancestral Puebloan sites in the Middle San Juan Region to test the hypothesis that this intensification is linked to an increase in the amount of maize in the turkeys’ diets. We find no significant change in δ13C or δ15N across the two time periods, and all of the specimens’ values indicate maize consumption. A plot of bone apatite δ13C against collagen δ13C is consistent with a model of diets high in C4protein, indicating that the turkeys did not use an alternative source of protein to maize and/or fauna that fed on maize. The reliance of both humans and turkeys on maize indicates a degree of turkey-human interdependency not previously known in the Middle San Juan Region. Future inquiries into the paleodiet of turkeys should target times and places where there is likely to have been a transition from hunting to domestication.

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20

Miller, W. P., T. C. Piechota, S. Gangopadhyay, and T. Pruitt. "Development of streamflow projections under changing climate conditions over Colorado River basin headwaters." Hydrology and Earth System Sciences 15, no. 7 (July 13, 2011): 2145–64. http://dx.doi.org/10.5194/hess-15-2145-2011.

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Abstract. The current drought over the Colorado River Basin has raised concerns that the US Department of the Interior, Bureau of Reclamation (Reclamation) may impose water shortages over the lower portion of the basin for the first time in history. The guidelines that determine levels of shortage are affected by relatively short-term (3 to 7 month) forecasts determined by the Colorado Basin River Forecast Center (CBRFC) using the National Weather Service (NWS) River Forecasting System (RFS) hydrologic model. While these forecasts by the CBRFC are useful, water managers within the basin are interested in long-term projections of streamflow, particularly under changing climate conditions. In this study, a bias-corrected, statistically downscaled dataset of projected climate is used to force the NWS RFS utilized by the CBRFC to derive projections of streamflow over the Green, Gunnison, and San Juan River headwater basins located within the Colorado River Basin. This study evaluates the impact of changing climate to evapotranspiration rates and contributes to a better understanding of how hydrologic processes change under varying climate conditions. The impact to evapotranspiration rates is taken into consideration and incorporated into the development of streamflow projections over Colorado River headwater basins in this study. Additionally, the NWS RFS is modified to account for impacts to evapotranspiration due to changing temperature over the basin. Adjusting evapotranspiration demands resulted in a 6 % to 13 % average decrease in runoff over the Gunnison River Basin when compared to static evapotranspiration rates. Streamflow projections derived using projections of future climate and the NWS RFS provided by the CBRFC resulted in decreased runoff in 2 of the 3 basins considered. Over the Gunnison and San Juan River basins, a 10 % to 15 % average decrease in basin runoff is projected through the year 2099. However, over the Green River basin, a 5 % to 8 % increase in basin runoff is projected through 2099. Evidence of nonstationary behavior is apparent over the Gunnison and San Juan River basins.

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21

Mendoza, Esmeralda, Sergio Aldana, and Carlos Castolo. "MODELACIÓN HIDROLÓGICA E HIDRÁULICA DEL MANEJO DE LAS AGUAS PLUVIALES URBANAS EN LA PARTE ALTA DE LA SUBCUENCA DEL RÍO SAN JUAN DE DIOS, GUADALAJARA, JALISCO." Vivienda y Comunidades Sustentables, no. 2 (July 1, 2017): 83–104. http://dx.doi.org/10.32870/rvcs.v0i2.22.

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El manejo de las aguas pluviales urbanas en la parte alta de la subcuenca del río San Juan de Dios se lleva a cabo a partir de una planeación insustentable del ciclo hidrológico y del funcionamiento del sistema hidráulico urbano. Por tal motivo, el objetivo del presente artículo es realizar una modelación hidrológica e hidráulica de las aguas pluviales en las actuales condiciones urbanas y en condiciones de restauración hidrológica de cuencas urbanas. Esto con el fin de evaluar los impactos o beneficios que cada escenario genera en la subcuenca de estudio. La investigación presentada ha evolucionado desde el año 2011 con el enfoque de restauración del ciclo hidrológico de cuencas urbanas. Para ello se considera la utilización del software Storm Water Management Model 5.1 (SWMM 5.1) para realizar la modelación hidrológica e hidráulica de las aguas pluviales en la parte alta de la subcuenca del río San Juan de Dios, Jalisco, México.

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DAVIES-VOLLUM, K. S., L. D. BOUCHER, P. HUDSON, and A. Y. PROSKUROWSKI. "A LATE CRETACEOUS CONIFEROUS WOODLAND FROM THE SAN JUAN BASIN, NEW MEXICO." PALAIOS 26, no. 2 (February 1, 2011): 89–98. http://dx.doi.org/10.2110/palo.2010.p10-090r.

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23

Beckstrom, J. A., and D. G. Boyer. "Aquifer Protection Considerations of Coalbed Methane Development in the San Juan Basin." SPE Formation Evaluation 8, no. 01 (March 1, 1993): 71–79. http://dx.doi.org/10.2118/21841-pa.

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24

Palmer, I. D., M. J. Mavor, J. P. Seidle, J. L. Spitler, and R. F. Voiz. "Openhole Cavity Completions in Coalbed Methane Wells in the San Juan Basin." Journal of Petroleum Technology 45, no. 11 (November 1, 1993): 1072–80. http://dx.doi.org/10.2118/24906-pa.

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25

Bybee, Karen. "Drilling for Coalbed Methane in the San Juan Basin With Coiled Tubing." Journal of Petroleum Technology 59, no. 06 (June 1, 2007): 73–76. http://dx.doi.org/10.2118/0607-0073-jpt.

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26

Li, Hugh Z., Mumbi Mundia-Howe, Matthew D. Reeder, and Natalie J. Pekney. "Constraining natural gas pipeline emissions in San Juan Basin using mobile sampling." Science of The Total Environment 748 (December 2020): 142490. http://dx.doi.org/10.1016/j.scitotenv.2020.142490.

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27

Harrod, Ryan P. "Subjugated in the San Juan Basin: Identifying Captives in the American Southwest." KIVA 84, no. 4 (October 2, 2018): 480–97. http://dx.doi.org/10.1080/00231940.2018.1528712.

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28

Haggart, James W., Peter D. Ward, and William Orr. "Turonian (Upper Cretaceous) lithostratigraphy and biochronology, southern Gulf Islands, British Columbia, and northern San Juan Islands, Washington State." Canadian Journal of Earth Sciences 42, no. 11 (November 1, 2005): 2001–20. http://dx.doi.org/10.1139/e05-066.

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Clastic strata preserved on Sidney Island, Barnes Island, and adjacent islands of the southernmost Gulf Islands of British Columbia and the northern San Juan Islands of Washington State are assigned to new stratigraphic units: the Sidney Island Formation and the Barnes Island Formation. The Sidney Island Formation consists of basal conglomerate and sandstone that grades upward through planar-stratified sandstone into hummocky cross-stratified sandstone and siltstone, all of which are deposited in relatively shallow-marine environments. The Barnes Island Formation, in contrast, consists of deep-marine conglomerate, sandstone, and mudstone that was deposited in a submarine-fan setting. Mollusk fossils from the Sidney Island Formation are of Early to Middle Turonian age, whereas ammonites and foraminifers from the Barnes Island Formation indicate a Late Turonian age. The Sidney Island Formation thus records initial marine transgression and inundation of basement rocks, followed by basin deepening that is transitional to the deep-marine submarine-fan deposits of the Barnes Island Formation. Sidney Island Formation strata have been considered previously as derived from uplift along the nearby San Juan thrust system in mid-Cretaceous time. However, the shallow-marine strata are internally well organized, and the facies succession is persistent across the formation's outcrop area. In addition, the formation lacks the distinctive detrital metamorphic mineral assemblages that are characteristic of older rocks of the San Juan Islands. These observations suggest that strata of the Sidney Island Formation did not accumulate immediately adjacent to active thrusting but rather in a more distal setting relative to the thrust system.

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Díaz, Juan Manuel. "Narrativas territoriales Embera entre el Alto San Juan y Magdalena Medio." REVISTA CONTROVERSIA, no. 214 (August 11, 2020): 167–208. http://dx.doi.org/10.54118/controver.vi214.1203.

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el artículo aborda cómo se percibe, interpreta y experimenta el destierro y el desarraigo derivado del conflicto armado, en dos comunidades Embera asentadas en el municipio de Puerto Boyacá, mediante un enfoque narrativo y territorial. En él se describen las principales características socio-políticas del pueblo Embera y la crisis humanitaria, mediante un enfoque cualitativo que se nutre de las historias de vida sobre el destierro y el desarraigo en la cuenca alta del río San Juan. Así mismo, revela los sentidos, tensiones y relaciones de poder que desarrollan las comunidades Embera en Puerto Boyacá, mediante una perspectiva cualitativa donde presenta un conjunto de continuidades y rupturas que revelan cómo opera la territorialidad Embera en escenarios de violencia y marginalización. Finalmente, ofrece herramientas teórico-metodológicas para analizar el destierro y el desarraigo como parte de procesos de territorialización que contienen prácticas y discursos asociados a la producción social de territorios y narrativas. Abstract: the article addresses how the banishment and uprooting derived from the armed conflict over two Embera communities settled in the municipality of Puerto Boyacá is perceived, interpreted and experienced through a narrative and territorial approach. The document describes the main socio-political characteristics of the Embera people and the humanitarian crisis through a qualitative approach that draws on life stories about the banishment and uprooting of the Upper San Juan river basin. The article reveals the senses, tensions and power relations that the Embera communities develop in Puerto Boyacá, through a qualitative perspective that presents a set of continuities, and ruptures that reveal how or Embera territoriality operates in scenarios of violence and marginalization. Finally, the article offers theoretical-methodological tools to analyze exile and uprooting as part of territorialization processes that involve practices and discourses associated with the social production of territories and narratives. Keywords: Embera, banishment, uprooting, territorialization, territorial narrative, human territoriality.

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Bennett, Katrina E., Theodore J. Bohn, Kurt Solander, Nathan G. McDowell, Chonggang Xu, Enrique Vivoni, and Richard S. Middleton. "Climate-driven disturbances in the San Juan River sub-basin of the Colorado River." Hydrology and Earth System Sciences 22, no. 1 (January 26, 2018): 709–25. http://dx.doi.org/10.5194/hess-22-709-2018.

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Abstract. Accelerated climate change and associated forest disturbances in the southwestern USA are anticipated to have substantial impacts on regional water resources. Few studies have quantified the impact of both climate change and land cover disturbances on water balances on the basin scale, and none on the regional scale. In this work, we evaluate the impacts of forest disturbances and climate change on a headwater basin to the Colorado River, the San Juan River watershed, using a robustly calibrated (Nash–Sutcliffe efficiency 0.76) hydrologic model run with updated formulations that improve estimates of evapotranspiration for semi-arid regions. Our results show that future disturbances will have a substantial impact on streamflow with implications for water resource management. Our findings are in contradiction with conventional thinking that forest disturbances reduce evapotranspiration and increase streamflow. In this study, annual average regional streamflow under the coupled climate–disturbance scenarios is at least 6–11 % lower than those scenarios accounting for climate change alone; for forested zones of the San Juan River basin, streamflow is 15–21 % lower. The monthly signals of altered streamflow point to an emergent streamflow pattern related to changes in forests of the disturbed systems. Exacerbated reductions of mean and low flows under disturbance scenarios indicate a high risk of low water availability for forested headwater systems of the Colorado River basin. These findings also indicate that explicit representation of land cover disturbances is required in modeling efforts that consider the impact of climate change on water resources.

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Henn, A., and D. Ostergren. "The San Juan River Basin Fluvial Restoration Database and the Conservation Registry (California)." Ecological Restoration 28, no. 4 (November 15, 2010): 415–17. http://dx.doi.org/10.3368/er.28.4.415.

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32

Kaiser, W. R., and W. B. Ayers. "Geologic and Hydrologic Characterization of Coalbed-Methane Reservoirs in the San Juan Basin." SPE Formation Evaluation 9, no. 03 (September 1, 1994): 175–84. http://dx.doi.org/10.2118/23458-pa.

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Wegert, D., and D. F. Parker. "Petrogenesis of the McDermott Formation trachyandesite, San Juan basin, Colorado and New Mexico." Rocky Mountain Geology 46, no. 2 (September 1, 2011): 183–96. http://dx.doi.org/10.2113/gsrocky.46.2.183.

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34

Denney, Dennis. "Integrated Digital Automation System for Production Optimization in the North San Juan Basin." Journal of Petroleum Technology 59, no. 08 (August 1, 2007): 56–57. http://dx.doi.org/10.2118/0807-0056-jpt.

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35

DeRosa, Sean E., P. Sue Downes, Rick Lentz, and David T. Allen. "Opportunities for Chemical Manufacturing Using Natural Gas Feedstocks in the San Juan Basin." Industrial & Engineering Chemistry Research 55, no. 30 (July 22, 2016): 8480–89. http://dx.doi.org/10.1021/acs.iecr.6b01370.

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36

Clemens, William A., and Thomas E. Williamson. "A new species ofEoconodon(Triisodontidae, Mammalia) from the San Juan Basin, New Mexico." Journal of Vertebrate Paleontology 25, no. 1 (March 11, 2005): 208–13. http://dx.doi.org/10.1671/0272-4634(2005)025[0208:ansoet]2.0.co;2.

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37

Lucas, S. G., and T. E. Williamson. "A New Taeniodont from the Paleocene of the San Juan Basin, New Mexico." Journal of Mammalogy 74, no. 1 (February 19, 1993): 175–79. http://dx.doi.org/10.2307/1381918.

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38

Clayton, J. L., D. D. Rice, and G. E. Michael. "Oil-generating coals of the San Juan Basin, New Mexico and Colorado, U.S.A." Organic Geochemistry 17, no. 6 (January 1991): 735–42. http://dx.doi.org/10.1016/0146-6380(91)90017-e.

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39

Esper Angillieri, María Yanina. "Morphometric analysis of Colangüil river basin and flash flood hazard, San Juan, Argentina." Environmental Geology 55, no. 1 (August 18, 2007): 107–11. http://dx.doi.org/10.1007/s00254-007-0969-2.

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40

Esper Angillieri, María Yanina, and Laura P. Perucca. "Geomorphology and morphometry of the de La Flecha river basin, San Juan, Argentina." Environmental Earth Sciences 72, no. 8 (April 3, 2014): 3227–37. http://dx.doi.org/10.1007/s12665-014-3227-4.

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41

Zhang, Ji, Catherine Yip, Chunjie Xia, and Yanna Liang. "Evaluation of methane release from coals from the San Juan basin and Powder River basin." Fuel 244 (May 2019): 388–94. http://dx.doi.org/10.1016/j.fuel.2019.02.020.

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42

Miranda, Omar, Mario Liotta, Alfredo Olguin, and Alejandro Degiorgis. "El Consumo Hídrico de la agricultura y la minería aurífera en la cuenca del Río Jáchal, Provincia de San Juan, Argentina." Aqua-LAC 2, no. 1 (March 31, 2010): 68–77. http://dx.doi.org/10.29104/phi-aqualac/2010-v2-1-07.

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En este trabajo se cuantificó el impacto de la minería aurífera en la disponibilidad de agua para riego en el valle de Jáchal, provincia de San Juan, Argentina. A partir del consumo hídrico de dos concesiones mineras sobre la cuenca del río Jáchal, Veladero (en explotación) y Lama (en etapa de estudio de impacto ambiental), se calculó el uso consuntivo de agua y el efecto regulador del embalse Cuesta del Viento. Suponiendo que los dos yacimientos mineros extraigan el volumen de agua máximo necesario para su funcionamiento en forma constante durante todo el año, se verificará una disminución de 4.47% en el caudal del río Jáchal, equivalente al agua que habría que entregar para regar una superficie de 728 ha de cultivos según el patrón actual de uso de suelo agrícola. Teniendo en cuenta el área en producción agrícola, la capacidad de distribución de la red de riego y la oferta hídrica promedio del río Jáchal, esto no generará déficit hídrico en los cultivos. Si bien en un año con bajas precipitaciones en cabecera de cuenca se puede contar con la reserva del dique Cuesta del Viento, en casos en los que el ciclo hidrológico seco se extendiese por más de cuatro años se debería tener en cuenta medidas para asegurar la provisión de agua para los cultivos de Jáchal.

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43

Salas, María J., Juan J. Rustán, and Andrea F. Sterren. "Lower and Middle Devonian Malvinokaffric ostracods from the Precordillera Basin of San Juan, Argentina." Journal of South American Earth Sciences 45 (August 2013): 56–68. http://dx.doi.org/10.1016/j.jsames.2013.02.002.

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44

Suvires, Graciela M. "The paradigm of paraglacial megafans of the San Juan river basin, Central Andes, Argentina." Journal of South American Earth Sciences 55 (November 2014): 166–72. http://dx.doi.org/10.1016/j.jsames.2014.07.008.

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45

Duff, Andrew I. "Culture and Ecology of Chaco Canyon and the San Juan Basin. Frances Joan Mathien." Journal of Anthropological Research 63, no. 1 (April 2007): 121–22. http://dx.doi.org/10.1086/jar.63.1.20371118.

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46

Gentzis, T. "Stability Analysis of a Horizontal Coalbed Methane Borehole in the San Juan Basin, USA." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 33, no. 21 (August 2011): 1969–84. http://dx.doi.org/10.1080/15567030903503233.

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47

Zhou, Zheng, Chris J. Ballentine, Rolf Kipfer, Martin Schoell, and Steve Thibodeaux. "Noble gas tracing of groundwater/coalbed methane interaction in the San Juan Basin, USA." Geochimica et Cosmochimica Acta 69, no. 23 (December 2005): 5413–28. http://dx.doi.org/10.1016/j.gca.2005.06.027.

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48

Flynn, Andrew G., and Daniel J. Peppe. "Early Paleocene tropical forest from the Ojo Alamo Sandstone, San Juan Basin, New Mexico, USA." Paleobiology 45, no. 4 (September 2019): 612–35. http://dx.doi.org/10.1017/pab.2019.24.

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AbstractEarliest Paleocene megafloras from North America are hypothesized to be low diversity and dominated by long-lived cosmopolitan species following the Cretaceous/Paleogene (K/Pg) mass extinction. However, megafloras used to develop this hypothesis are from the Northern Great Plains (NGP) of North America, and relatively little is known about floras from southern basins. Here, we present a quantitative analysis of an earliest Paleocene megaflora (<350 kyr after K/Pg boundary) from the Ojo Alamo Sandstone in the San Juan Basin (SJB), New Mexico. The megaflora, comprising 53 morphotypes, was dominated by angiosperms, with accessory taxa composed of pteridophytes, lycophytes, and conifers. Diversity analyses indicate a species-rich, highly uneven, and laterally heterogeneous flora. Paleoclimate estimates using multivariate and univariate methods indicate warm temperatures and relatively high precipitation consistent with a modern tropical seasonal forest.When compared with contemporaneous floras from the Denver Basin (DB) of Colorado and the Williston Basin (WB) of North Dakota, the SJB flora had significantly higher species richness but lower evenness. Paleoclimate estimates from the SJB were 7–14°C warmer than the estimates for the DB and WB, indicating a shift from a temperate forest in the NGP to a tropical forest in the SJB. These results demonstrate the presence of a latitudinal floral diversity and paleoclimatic gradient during the earliest Paleocene in western North America. We hypothesize that the warm, wet conditions in the earliest Paleocene SJB drove rapid rates of speciation following the K/Pg boundary, resulting in a diverse and heterogeneous flora.

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49

Boeglin, Nicolás. "Minería Química a cielo abierto y políticas ambientales en la cuenca del río San Juan (Nicaragua-Costa Rica) desde una Perspectiva Jurídica." Aqua-LAC 3, no. 2 (September 30, 2011): 92–104. http://dx.doi.org/10.29104/phi-aqualac/2011-v3-2-02.

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A la confluencia de una geografía, siempre caprichosa, y del derecho, mucho menos caprichoso, nos encontramos ante un polémico proyecto de minería química a cielo abierto ubicado en la zona norte de Costa Rica (Las Crucitas), de la empresa canadiense Infinito Gold. Este proyecto se sitúa en un punto fronterizo con Nicaragua caracterizado por altas precipitaciones y en directa relación hidrográfica con la cuenca internacional del Río San Juan. Se trata de una zona con características peculiares propias del trópico húmedo en la que se pretendía ubicar este proyecto (que se hubiese convertido en el más grande proyecto minero metálico a cielo abierto en Centroamérica). Esta información científica no fue debidamente incorporada en los estudios de la Secretaría Técnica Nacional para el Ambiente (SETENA) de Costa Rica o de la misma Empresa Infinito Gold, exponiéndose así a Costa Rica, como Estado, a las reglas y regulaciones internacionales en la materia. A nivel nacional, el Servicio Nacional de Aguas Subterráneas, Riego y Avenamiento (SENARA) nunca fue solicitado para realizar un estudio de campo sobre las aguas subterráneas en esa zona, y el Estudio de Impacto Ambiental (EIA) aprobado por la SETENA se basó en un estudio del 2002 cuando el proyecto tenía una profundidad de 15 m, mientras que le proyecto “ampliado” (en diciembre del 200/) conlleva profundidades de hasta 65 m. El proyecto se encontraba suspendido temporalmente debido a varios recursos presentados ante la Sala Constitucional de Costa Rica después de la publicación en la Gaceta Oficial de un no menos polémico Decreto Ejecutivo (firmado el 13 de octubre del 2008 por el Presidente de Costa Rica Oscar Arias Sánchez y su Ministro del Ambiente, Roberto Dobles) que declara este proyecto “de interés público y conveniencia nacional”. En una polémica decisión del 16 de abril del 2010, la Sala Constitucional rechazó los recursos presentados, dado luz verde al proyecto minero. Recursos pendientes presentados ante el Tribunal Contencioso Administrativo lograron suspender el proyecto, en una contundente decisión dictada por este órgano de justicia en noviembre del 2010. No obstante, el proyecto Crucitas fue mencionado en distintas ocasiones por Nicaragua, tanto en el plano bilateral, como en sus contiendas contra Costa Rica ante la Corte Internacional de Justicia.

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Hu, Hai Yan, Zhen Duo He, and Bao Cai Chen. "Accumulated Conditions of Shale Gas in the Middle-Low Palaeozoic, Yangtze Platform, China." Advanced Materials Research 524-527 (May 2012): 122–25. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.122.

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Shale gas is an important unconventional natural gas resource. There is probably abundant shale gas resource in the Longmaxi Formation of the lower Silurian, Sichuan Basin, West China. Longmaxi Formation is high quality source rock, its TOC(total organic carbon) up to the most vulue 6.5 percent; the Formation more than 1percent TOC is up to 105 meters. Because of high maturity, it cannot identify the kerogen type by element Carbon and Hydron ratio, rather than carbon isotopic value. The isotopic carbon values of Kerogens are more than 29.67 permillage, which showed One Type Kerogen. In the Longmaxi Formation, source rock is up to post maturity and lack of vitrinite, so vitrinite reflectance cannot measure the source maturity. It can measure bitumen reflectance, then calculate relevant vitrinite reflectance (Ro) by bitumen reflectance to identify the organic matter thermal evolution degree. The result showed the maturity degree of organic matter equal to more than 3 percent vitrinite reflectance (Ro), which showed the source rock yielded rich thermogenic gas during the geological thermal evolution. The source rock of Longmaxi Formation has some silt partly composed of quartz mineral, up to 40 percent, which is beneficial to gas reservoir. So, it has available shale gas developed elements because of rich organic matter, high thermal maturity degree, good pool. The geological analogy method is used to assess the resource potential. Sichuan Basin has drastically similar to Michigan Basin and San Juan Basin in basin type, seal conditions, reservoir states, source rock, matched condition and so on. So they are selected as standard basin. Sixteen parameters are used to appraise the shale gas pool geological conditions. Compared with Michigan Basin and San Juan Basin by analogy method, Longmaxi Formation shale gas potential is 0.06-0.36 billion cubic meter per square kilometer.

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