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Journal articles on the topic 'Cedar Mountain Formation'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Harris, Elisha B., and Nan Crystal Arens. "A mid-Cretaceous angiosperm-dominated macroflora from the Cedar Mountain Formation of Utah, USA." Journal of Paleontology 90, no. 4 (July 2016): 640–62. http://dx.doi.org/10.1017/jpa.2016.44.

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AbstractAngiosperms first appeared in the fossil record as pollen during the Valanginian–Hauterivian; they spread out of the tropics in the Aptian and Albian, and radiated in the Late Cretaceous. Despite these general patterns, details of the taxonomic, geographic, and ecological evolution of Cretaceous angiosperms are relatively poorly known because only a handful of Early and mid-Cretaceous macrofloras have been reported. This is the first detailed report of a fossil leaf flora from the Cedar Mountain Formation from the mid-Cretaceous of the Western Interior. We describe a flora that is overwhelmingly dominated by angiosperms (152 of 153 identified specimens are angiosperms) from the Albian–Cenomanian transition that is preserved in a clay- and carbonate-rich, lacustrine mudstone from the uppermost Cedar Mountain Formation of Emery County, Utah. We recognize 18 leaf morphotypes, all of which are dicotyledonous angiosperms. The majority of the Cedar Mountain morphotypes have taxonomic affinities with forms of similar age described from the Atlantic and Gulf coastal plains and other localities from the Western Interior. From this, we infer that a relatively diverse angiosperm flora grew along the margins of a small pond on the coastal plain. Palynological preparations of the fossil matrix were barren; however, previous studies of other facies within the formation showed that both conifers and ferns were important components of the regional vegetation during Cedar Mountain time. The effective absence of conifers and ferns in this macroflora and low leaf mass per area values among the angiosperms measured suggests that even at the Early–Late Cretaceous transition, angiosperms had come to dominate some sites, particularly those that were disturbed or seasonally ephemeral, where fast-growth or seasonal deciduousness would have been favored.

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2

Britt, Brooks B., Rodney D. Scheetz, Donald B. Brinkman, and David A. Eberth. "A Barremian neochoristodere from the Cedar Mountain Formation, Utah, U.S.A." Journal of Vertebrate Paleontology 26, no. 4 (December 11, 2006): 1005–8. http://dx.doi.org/10.1671/0272-4634(2006)26[1005:abnftc]2.0.co;2.

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3

Joeckel, R. M., G. A. Ludvigson, A. Möller, C. L. Hotton, M. B. Suarez, C. A. Suarez, B. Sames, J. I. Kirkland, and B. Hendrix. "Chronostratigraphy and terrestrial palaeoclimatology of Berriasian–Hauterivian strata of the Cedar Mountain Formation, Utah, USA." Geological Society, London, Special Publications 498, no. 1 (October 17, 2019): 75–100. http://dx.doi.org/10.1144/sp498-2018-133.

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AbstractThis paper presents breakthroughs in the chronostratigraphy of the heretofore poorly constrained Yellow Cat Member of the Cedar Mountain Formation, which is an important record of terrestrial environments, ecosystems and global change in the ancient North American Cordilleran foreland. Zircon populations from 10 stratigraphic horizons in the Yellow Cat Member yield youngest single-grain ages ranging from 142.5 ± 2.7 to 133.7 ± 2.7 Ma (Berriasian–late Valanginian); those from one mudstone palaeosol yield a robust Concordia Age of 136.3 ± 1.3 (Valanginian). Additionally, a new palynoflora – one of a few to be published from the Cedar Mountain Formation – is assigned to the middle Berriasian to early Hauterivian stages, based on the presence of Foraminisporis wonthaggiensis and Trilobosporites sp. cf. T. canadensis, and the absence of F. asymmetricus, Appendicisporites spp. and angiosperms. Furthermore, these chronostratigraphic data allow us to interpret part of the so-called ‘Weissert Event’ C-isotope excursion (Valanginian) in a new C-isotope profile through a palaeosol-bearing alluvial succession in the Yellow Cat Member. This research extends a firm understanding of the formation further back into the Early Cretaceous than was the case previously (except for ostracod biostratigraphy) and sets the stage for future advancements.

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4

Taylor, Michael P., Mathew J. Wedel, and Richard L. Cifelli. "A New Sauropod Dinosaur from the Lower Cretaceous Cedar Mountain Formation, Utah, USA." Acta Palaeontologica Polonica 56, no. 1 (March 2011): 75–98. http://dx.doi.org/10.4202/app.2010.0073.

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5

Lockley, Martin G., Diane White, James Kirkland, and Vince Santucci. "Dinosaur Tracks from the Cedar Mountain Formation (Lower Cretaceous), Arches National Park, Utah." Ichnos 11, no. 3-4 (July 2004): 285–93. http://dx.doi.org/10.1080/10420940490428742.

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6

SHAPIRO, R. S., H. C. FRICKE, and K. FOX. "DINOSAUR-BEARING ONCOIDS FROM EPHEMERAL LAKES OF THE LOWER CRETACEOUS CEDAR MOUNTAIN FORMATION, UTAH." PALAIOS 24, no. 1 (January 1, 2009): 51–58. http://dx.doi.org/10.2110/palo.2008.p08-013r.

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7

Lorenz, John C., Scott P. Cooper, and William A. Olsson. "Natural fracture distributions in sinuous, channel-fill sandstones of the Cedar Mountain Formation, Utah." AAPG Bulletin 90, no. 9 (September 2006): 1293–308. http://dx.doi.org/10.1306/03300605137.

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8

Nydam, Randall L., and Richard L. Cifelli. "A new teiid lizard from the Cedar Mountain Formation (Albian–Cenomanian boundary) of Utah." Journal of Vertebrate Paleontology 22, no. 2 (July 8, 2002): 276–85. http://dx.doi.org/10.1671/0272-4634(2002)022[0276:antlft]2.0.co;2.

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9

Carpenter, Kenneth, Jeff Bartlett, John Bird, and Reese Barrick. "Ankylosaurs from the Price River Quarries, Cedar Mountain Formation (Lower Cretaceous), east-central Utah." Journal of Vertebrate Paleontology 28, no. 4 (December 12, 2008): 1089–101. http://dx.doi.org/10.1671/0272-4634-28.4.1089.

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10

Kirkland, James, Marina Suarez, Celina Suarez, and ReBecca Hunt-Foster. "The Lower Cretaceous in east-central Utah—The Cedar Mountain Formation and its bounding strata." Geology of the Intermountain West 3 (January 1, 2016): 101–228. http://dx.doi.org/10.31711/giw.v3.pp101-228.

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Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.

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11

Kirkland, James I., Marina Suarez, Celina Suarez, and ReBecca Hunt-Foster. "The Lower Cretaceous in east-central Utah—The Cedar Mountain Formation and its bounding strata." Geology of the Intermountain West 3 (May 26, 2016): 101–228. http://dx.doi.org/10.31711/giw.v3i0.9.

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Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.

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12

Lockley, Martin G., Lisa G. Buckley, John R. Foster, James I. Kirkland, and Donald D. DeBlieux. "First report of bird tracks (Aquatilavipes) from the Cedar Mountain Formation (Lower Cretaceous), eastern Utah." Palaeogeography, Palaeoclimatology, Palaeoecology 420 (February 2015): 150–62. http://dx.doi.org/10.1016/j.palaeo.2014.12.014.

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13

McDonald, Andrew T., John Bird, James I. Kirkland, and Peter Dodson. "Osteology of the Basal Hadrosauroid Eolambia caroljonesa (Dinosauria: Ornithopoda) from the Cedar Mountain Formation of Utah." PLoS ONE 7, no. 10 (October 15, 2012): e45712. http://dx.doi.org/10.1371/journal.pone.0045712.

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14

Schmeisser, Rebecca L., and Tim P. Flood. "Recognition of Paleogastroliths from the Lower Cretaceous Cedar Mountain Formation, Utah using a Scanning Electron Microscope." Ichnos 15, no. 2 (May 6, 2008): 72–77. http://dx.doi.org/10.1080/10420940801909118.

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15

Lockley, Martin, R. Fleming, and Kelly Conrad. "Distribution and Significance of Mesozoic Vertebrate Trace Fossils in Dinosaur National Monument." UW National Parks Service Research Station Annual Reports 14 (January 1, 1990): 39–41. http://dx.doi.org/10.13001/uwnpsrc.1990.2867.

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Dinosaur National Monument (DINO) encompasses an area that has rocks with a high potential for preservation of vertebrate trace fossils, especially dinosaur tracks. The purpose of this research is to document the presence, type, and distribution of vertebrate trace fossils in Mesozoic rocks exposed in DINO. These rocks include the Moenkopi Formation, Chinle/Popo Agie Formation, Glen Canyon Sandstone, Carmel Formation, Entrada Sandstone, Morrison Formation, Cedar Mountain Formation, Dakota Formation, and Frontier Formation. This study will increase our knowledge of the stratigraphic and geographic distribution of vertebrate tracks as well as provide taxonomic, behavioral, and paleoenvironmental data. During the 1990 field season, reconnaissance of the western part of DINO revealed the presence of vertebrate trace fossils in the Chinle/Popo Agie Formation. In addition, our examination of the Moenkopi Formation suggests that vertebrate tracks are probably present in this unit. Locality information was also obtained for probable track-sites in the Carmel Formation, Entrada Sandstone, and Morrison Formation.

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16

Tidwell, W. D., and G. F. Thayn. "Flora of the Lower Cretaceous Cedar Mountain Formation of Utah and Colorado, Part IV. Palaeopiceoxylon thinosus (Protopinaceae)." Southwestern Naturalist 30, no. 4 (November 27, 1985): 525. http://dx.doi.org/10.2307/3671046.

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17

Britt, Brooks B., David A. Eberth, Rod D. Scheetz, Brent W. Greenhalgh, and Kenneth L. Stadtman. "Taphonomy of debris-flow hosted dinosaur bonebeds at Dalton Wells, Utah (Lower Cretaceous, Cedar Mountain Formation, USA)." Palaeogeography, Palaeoclimatology, Palaeoecology 280, no. 1-2 (September 2009): 1–22. http://dx.doi.org/10.1016/j.palaeo.2009.06.004.

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18

McDonald, Andrew T., James I. Kirkland, Donald D. DeBlieux, Scott K. Madsen, Jennifer Cavin, Andrew R. C. Milner, and Lukas Panzarin. "New Basal Iguanodonts from the Cedar Mountain Formation of Utah and the Evolution of Thumb-Spiked Dinosaurs." PLoS ONE 5, no. 11 (November 22, 2010): e14075. http://dx.doi.org/10.1371/journal.pone.0014075.

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19

KIRKLAND, JAMES I., EDWARD L. SIMPSON, DONALD D. DeBLIEUX, SCOTT K. MADSEN, EMILY BOGNER, and NEIL E. TIBERT. "DEPOSITIONAL CONSTRAINTS ON THE LOWER CRETACEOUS STIKES QUARRY DINOSAUR SITE: UPPER YELLOW CAT MEMBER, CEDAR MOUNTAIN FORMATION, UTAH." PALAIOS 31, no. 9 (September 2016): 421–39. http://dx.doi.org/10.2110/palo.2016.041.

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20

Thayn, G. F., W. D. Tidwell, and W. L. Stokes. "FLORA OF THE LOWER CRETACEOUS CEDAR MOUNTAIN FORMATION OF UTAH AND COLORADO. PART III: ICACINOXYLON PITTIENSE N. SP." American Journal of Botany 72, no. 2 (February 1985): 175–80. http://dx.doi.org/10.1002/j.1537-2197.1985.tb08281.x.

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21

Robertson, Clay, Greg A. Ludvigson, R. M. Joeckel, Sahar Mohammadi, and James I. Kirkland. "Differentiating early from later diagenesis in a Cretaceous sandstone and petroleum reservoir of the Cedar Mountain Formation, Utah." Rocky Mountain Geology 56, no. 1 (June 1, 2021): 19–36. http://dx.doi.org/10.24872/rmgjournal.56.1.19.

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ABSTRACT Previously published anomalous whole-rock stable isotopic values from the Poison Strip Sandstone Member of the Cretaceous Cedar Mountain Formation (CMF) of eastern Utah are of uncertain origins. This study investigated the diagenetic history and the processes responsible for these anomalous data. Accordingly, we integrated photomicroscopic techniques including polarized light microscopy, epifluorescence and cathodoluminescence (CL) imaging, micromilling of stable isotope samples, and fluid-inclusion heating and freezing measurements to this end. The key observations involved the microscopic mapping of calcite cement stratigraphy using CL imaging to permit the analysis of stable isotopes of calcite cements that crystallized during early and late diagenesis. The mapping of calcite cement zones of sufficient submillimeter size to mill out and isolate microgram-sized stable isotope samples enabled this discrimination. Early diagenetic calcite cements have the most positive δ18O values (-10 to -8.5‰ Vienna Pee Dee Belemnite [VPDB]) of all components. The pattern of δ13C and δ18O variation in this early diagenetic cement indicates affinities with early meteoric diagenesis previously documented in published literature on the CFM. The late diagenetic calcite cements yield the most negative δ18O values (-18 to -16‰ VPDB). We interpret the late diagenetic cements to be responsible for the anomalously low whole-rock δ18O values previously reported from the Poison Strip Sandstone Member. Our discoveries of bitumen in late-stage pore fillings and liquid petroleum in the fluid inclusions of late diagenetic calcite cements of the Poison Strip Sandstone Member explain the lower whole-rock organic matter δ13C values and anomalous Δ13C values reported from the unit. Comparatively lower carbonate δ18O and organic δ13C values originally derived from whole-rock analyses of samples from the Poison Strip Sandstone Member resulted from high-temperature basinal diagenesis (hydrothermal circulation and/or petroleum migration), rather than the alternative interpretation of early diagenesis related to a Cretaceous paleoclimatic perturbation. Our results are illustrative of methods to resolve the long-standing geologic problem of discriminating and characterizing products of early vs. late diagenesis in terrigenous clastic sedimentary strata.

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22

Jin, Xingsheng, Yoichi Azuma, Frankie D. Jackson, and David J. Varricchio. "Giant dinosaur eggs from the Tiantai basin, Zhejiang Province, China." Canadian Journal of Earth Sciences 44, no. 1 (January 1, 2007): 81–88. http://dx.doi.org/10.1139/e06-077.

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Giant dinosaur eggs occur within the mid-Cretaceous Liangtoutang Formation of the Tiantai basin in Zhejiang Province of southeastern China. The 43 cm × 14.5 cm eggs represent the first discovery of Macroelongatoolithus xixiaensis specimens from the region. The eggshell exhibits variation in surface ornamentation and eggshell thickness, with smoother and thicker eggshell characteristic of the poles. The Tiantai eggs differ from the stratigraphically younger type specimen of Macroelongatoolithus xixiaensis from Henan Province in their mammillary to continuous layer ratio. Three new features potentially useful for phylogenetic analysis and previously unreported in Macroelongatoolithus and other eggs in the oofamily Elongatoolithidae include prismatic columns, tabular structure within the prisms, and "splaying" of the crystals in the upper mammillae that extend into the overlying continuous layer. Microstructural features of the two nearly complete eggs suggest that the specimens are referable to a potentially large theropod dinosaur. Paleogeographic distribution of these large theropod eggs includes the Late Cretaceous Zoumagang Formation of Henan Province and the mid-Cretaceous Liangtoutang Formation of Zhejiang Province in central and southeastern China and possibly the Lower Cretaceous Cedar Mountain Formation and mid-Cretaceous Dakota Formation of Utah, USA.

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23

Arens, Nan Crystal, and Elisha B. Harris. "Paleoclimatic reconstruction for the Albian–Cenomanian transition based on a dominantly angiosperm flora from the Cedar Mountain Formation, Utah, USA." Cretaceous Research 53 (March 2015): 140–52. http://dx.doi.org/10.1016/j.cretres.2014.11.004.

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24

Suarez, Celina A., Luis A. González, Gregory A. Ludvigson, Richard L. Cifelli, and Emily Tremain. "Water utilization of the Cretaceous Mussentuchit Member local vertebrate fauna, Cedar Mountain Formation, Utah, USA: Using oxygen isotopic composition of phosphate." Palaeogeography, Palaeoclimatology, Palaeoecology 313-314 (January 2012): 78–92. http://dx.doi.org/10.1016/j.palaeo.2011.10.011.

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25

McDonald, Andrew T., Terry A. Gates, Lindsay E. Zanno, and Peter J. Makovicky. "Anatomy, taphonomy, and phylogenetic implications of a new specimen of Eolambia caroljonesa (Dinosauria: Ornithopoda) from the Cedar Mountain Formation, Utah, USA." PLOS ONE 12, no. 5 (May 10, 2017): e0176896. http://dx.doi.org/10.1371/journal.pone.0176896.

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26

Tucker, Ryan T., Lindsay E. Zanno, Hui-Qing Huang, and Peter J. Makovicky. "A refined temporal framework for newly discovered fossil assemblages of the upper Cedar Mountain Formation (Mussentuchit Member), Mussentuchit Wash, Central Utah." Cretaceous Research 110 (June 2020): 104384. http://dx.doi.org/10.1016/j.cretres.2020.104384.

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27

Eberth, David A., Brooks B. Britt, Rod Scheetz, Kenneth L. Stadtman, and Donald B. Brinkman. "Dalton Wells: Geology and significance of debris-flow-hosted dinosaur bonebeds in the Cedar Mountain Formation (Lower Cretaceous) of eastern Utah, USA." Palaeogeography, Palaeoclimatology, Palaeoecology 236, no. 3-4 (June 2006): 217–45. http://dx.doi.org/10.1016/j.palaeo.2005.11.020.

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28

Cardenas, Benjamin T., David Mohrig, Timothy A. Goudge, Cory M. Hughes, Joseph S. Levy, Travis Swanson, Jasmine Mason, and Feifei Zhao. "The anatomy of exhumed river‐channel belts: Bedform to belt‐scale river kinematics of the Ruby Ranch Member, Cretaceous Cedar Mountain Formation, Utah, USA." Sedimentology 67, no. 7 (July 17, 2020): 3655–82. http://dx.doi.org/10.1111/sed.12765.

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29

Suarez, C. A., L. A. Gonzalez, G. A. Ludvigson, J. I. Kirkland, R. L. Cifelli, and M. J. Kohn. "Multi-Taxa Isotopic Investigation of Paleohydrology In the Lower Cretaceous Cedar Mountain Formation, Eastern Utah, U.S.A.: Deciphering Effects Of the Nevadaplano Plateau On Regional Climate." Journal of Sedimentary Research 84, no. 11 (October 28, 2014): 975–87. http://dx.doi.org/10.2110/jsr.2014.76.

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30

Zou, Guiwu, Yuanqiu Liu, Fanqian Kong, Liqin Liao, Guanghua Deng, Xueru Jiang, Junhuo Cai, and Wei Liu. "Depression of the soil arbuscular mycorrhizal fungal community by the canopy gaps in a Japanese cedar (Cryptomeria japonica) plantation on Lushan Mountain, subtropical China." PeerJ 9 (March 15, 2021): e10905. http://dx.doi.org/10.7717/peerj.10905.

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Both canopy gaps (CG) and arbuscular mycorrhizal fungi (AMF) play key roles in seedling establishment and increasing species diversity in forests. The response of AMF to canopy gaps is poorly understood. To assess the long-term effects of canopy gaps on soil AMF community, we sampled soil from plots in a 50-year Cryptomeria japonica (L.f.) D. Don. plantation, located in Lushan Mountain, subtropical China. We analyzed the AMF community, identified through 454 pyrosequencing, in soil and edaphic characteristics. Both richness and diversity of AMF in CG decreased significantly compared to the closed canopy (CC). The differences of the AMF community composition between CG and CC was also significant. The sharp response of the AMF community appears to be largely driven by vegetation transformation. Soil nutrient content also influenced some taxa, e.g., the low availability of phosphorus increased the abundance of Acaulospora. These results demonstrated that the formation of canopy gaps can depress AMF richness and alter the AMF community, which supported the plant investment hypothesis and accentuated the vital role of AMF–plant symbioses in forest management.

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31

Avrahami, Haviv M., Terry A. Gates, Andrew B. Heckert, Peter J. Makovicky, and Lindsay E. Zanno. "A new microvertebrate assemblage from the Mussentuchit Member, Cedar Mountain Formation: insights into the paleobiodiversity and paleobiogeography of early Late Cretaceous ecosystems in western North America." PeerJ 6 (November 16, 2018): e5883. http://dx.doi.org/10.7717/peerj.5883.

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The vertebrate fauna of the Late Cretaceous Mussentuchit Member of the Cedar Mountain Formation has been studied for nearly three decades, yet the fossil-rich unit continues to produce new information about life in western North America approximately 97 million years ago. Here we report on the composition of the Cliffs of Insanity (COI) microvertebrate locality, a newly sampled site containing perhaps one of the densest concentrations of microvertebrate fossils yet discovered in the Mussentuchit Member. The COI locality preserves osteichthyan, lissamphibian, testudinatan, mesoeucrocodylian, dinosaurian, metatherian, and trace fossil remains and is among the most taxonomically rich microvertebrate localities in the Mussentuchit Member. To better refine taxonomic identifications of isolated theropod dinosaur teeth, we used quantitative analyses of taxonomically comprehensive databases of theropod tooth measurements, adding new data on theropod tooth morphodiversity in this poorly understood interval. We further provide the first descriptions of tyrannosauroid premaxillary teeth and document the earliest North American record of adocid remains, extending the appearance of this ancestrally Asian clade by 5 million years in western North America and supporting studies of pre-Cenomaninan Laurasian faunal exchange across Beringia. The overabundance of mesoeucrocodylian remains at the COI locality produces a comparatively low measure of relative biodiversity when compared to other microvertebrate sites in the Mussentuchit Member using both raw and subsampling methods. Much more microvertebrate research is necessary to understand the roles of changing ecology and taphonomy that may be linked to transgression of the Western Interior Seaway or microhabitat variation.

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32

Garrison, James R., Donald Brinkman, Douglas J. Nichols, Paul Layer, Donald Burge, and Denise Thayn. "A multidisciplinary study of the Lower Cretaceous Cedar Mountain Formation, Mussentuchit Wash, Utah: a determination of the paleoenvironment and paleoecology of the Eolambia caroljonesa dinosaur quarry." Cretaceous Research 28, no. 3 (June 2007): 461–94. http://dx.doi.org/10.1016/j.cretres.2006.07.007.

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33

Hunt-Foster, ReBecca, Martin Lockley, Andrew Milner, John Foster, Neffra Matthews, Brent Breithaupt, and Joshua Smith. "Tracking dinosaurs in BLM canyon country, Utah." Geology of the Intermountain West 3 (January 1, 2016): 67–100. http://dx.doi.org/10.31711/giw.v3.pp67-100.

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Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.

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34

Hunt-Foster, ReBecca K., Martin G. Lockley, Andrew R. C. Milner, John R. Foster, Neffra A. Matthews, Brent H. Breithaupt, and Joshua A. Smith. "Tracking dinosaurs in BLM canyon country, Utah." Geology of the Intermountain West 3 (May 26, 2018): 67–100. http://dx.doi.org/10.31711/giw.v3i0.8.

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Abstract:

Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, and biostratigraphy of these medial Mesozoic strata that document the dynamic and complex geological history of this region. Additionally, these data provide a framework by which to examine the history of terrestrial faunas during the final breakup of Pangaea. In fact, the medial Mesozoic faunal record of eastern Utah should be considered a keystone in understanding the history of life across the northern hemisphere. Following a period of erosion and sediment bypass spanning the Jurassic–Cretaceous boundary, sedimentation across the quiescent Colorado Plateau began during the Early Cretaceous. Thickening of these basal Cretaceous strata across the northern Paradox Basin indicate that salt tectonics may have been the predominant control on deposition in this region leading to the local preservation of fossiliferous strata, while sediment bypass continued elsewhere. Thickening of overlying Aptian strata west across the San Rafael Swell provides direct evidence of the earliest development of a foreland basin with Sevier thrusting that postdates geochemical evidence for the initial development of a rain shadow.

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35

Clark, Donald. "Northern Cedar Mountains Red Beds, Tooele County." Geosites 1 (March 12, 2019): 1–5. http://dx.doi.org/10.31711/geosites.v1i1.57.

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Recent mapping for the Tooele 30' x 60' quadrangle geologic map revealed more information about interesting exposures of red beds cropping out in an 11-mile (18-km) swath along the northwestern flank of the Cedar Mountains (Clark and others, 2017, 2019 in review). They are unusual because such rocks are seldom preserved in northwestern Utah, an area known for thick thrust sheets of Paleozoic marine carbonate and sandstone. These rocks were first mapped by Robert Maurer for his Ph.D. dissertation on the geology of the Cedar Mountains (Maurer, 1970). He called them North Horn (?) Formation and noted the presence of fresh-water snails (Gyraulus sp.) that a paleontologist said were probably of late Paleocene or Eocene age. The North Horn Formation is considered Late Cretaceous (Maastrichtian age) to Paleocene or Eocene (~70 to 60 Ma) in age. However, recent detrital zircon analysis from sandstone in the unit suggest a much older age, with the youngest grains (maximum depositional age) of 117 Ma, or Early Cretaceous, Aptian (UGS and O’Sullivan, 2017). Two samples of gray mudstone taken for fossil pollen in the unit did not produce any usable material. Inspection of these rocks by Don DeBlieux (Utah Geological Survey paleontologist) revealed no bone or other biological material at this location.

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Rodríguez García, Gabriel, and Gloria Obando. "Volcanism of the La Quinta Formation in the Perijá mountain range." Boletín Geológico, no. 46 (June 30, 2020): 51–94. http://dx.doi.org/10.32685/0120-1425/boletingeo.46.2020.535.

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This study reports new data on the petrography, total rock chemistry and U-Pb zircon geochronology of volcanic rocks of the La Quinta Formation that outcrop the western flank of the Perijá mountain range and the Cesar and La Guajira departments. The volcanic rocks consist of basaltic, andesitic, dacitic and rhyolitic lavas, and the volcaniclastic rocks consist of crystal-vitric and crystal-lithic tuffs and agglomerates of calc-alkaline affinity, formed in a continental margin arc setting. Geochronological data suggest that the La Quinta Formation was volcanically active for approximately 25 Ma, during which its composition varied from basaltic trachyandesites to rhyolites. U-Pb dating suggests that the volcanism began in approximately 191 Ma (Sinemurian age) and continued until approximately 164 Ma, with at least three periods of increased volcanic activity. The inherited zircons contain Triassic, Permian, Neoproterozoic and Mesoproterozoic populations, indicating that this arc was emplaced on rocks of the Chibcha Terrane along the South American paleomargin and that it is part of the same arc that formed the Jurassic volcanic rocks of the Sierra Nevada de Santa Marta, Cocinas and San Lucas mountain ranges and the Upper Magdalena Valley.

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Samdan, Andrey Mikhailovich. "The vegetation cover of the «Aryskannyg» cluster of the «Ubsunurskaya Kotlovina» Reserve (Ubsunur hollow) (the southern slopes of the East Tannu-Ola Mountain Range, Republic of Tyva)." Samara Journal of Science 10, no. 2 (June 1, 2021): 78–85. http://dx.doi.org/10.17816/snv2021102111.

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This paper studies the vegetation cover organization of the Aryskannyg cluster of the state natural biosphere reserve Ubsunurskaya Kotlovina. In the course of the work 2 ecological and phytocoenotic profiles were laid and 2 large-scale mapping was carried out. The steppe type of vegetation is mainly represented by different variants of real turf-and-slag steppes: shrubby, petrophytic and dry. The original steppe communities are the resurrection ( Selaginella sanguinolenta ) and eastern feather grass coenoses ( Stipa orientalis ). An independent high-altitude belt forms mountain expositional forest-steppes. The forest component consists of grass and rhytidium larch forests, and the daurian rhododendron occupies an active position in the undergrowth. The steppe component consists of thickened mixed-grass-stop-grass meadow, as well as mixed-grass-fine-grained-slag petrophytic steppes. The mountain-taiga belt is represented by communities of larch and cedar formations. The high-altitude belt is dominated by yernik ( Betula rotundifolia ) and dryad ( Dryas oxyodontha ) mountain-tundra communities. It is revealed that the territory has a complex vegetation cover, which was formed in the conditions of mountain relief and sharply continental climate, the diversity of plant communities (from dry-steppe to mountain-tundra) is due to the length of the cluster territory in three high-altitude zones and the complex influence of latitudinal and local abiotic factors. The leading factors in the distribution of vegetation are the exposure of the slopes and the absolute height of the terrain.

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Sorauf, James E. "The rugose coral Tabulophyllum traversensis from the Oñate Formation (Middle Devonian) of the Mud Springs Mountains, New Mexico." Journal of Paleontology 61, no. 1 (January 1987): 14–20. http://dx.doi.org/10.1017/s0022336000028158.

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The Oñate Formation of Middle Devonian (Givetian) age is exposed in the Mud Springs Mountains of New Mexico, where it is represented by an unusually shaly and extremely fossiliferous facies. Tabulophyllum traversensis (Winchell) found here is the only rugose coral species known thus far from Middle Devonian rocks of New Mexico and is of special interest as evidence of migration between the area of the Oñate occurrence and those in the Cedar Valley Limestone in Iowa and the Traverse Group of Michigan. The occurrence is also of interest because of the association of the Oñate coral with the receptaculitid Sphaerospongia sp. cf. S. tessellata (also known from Canada, Australia, and New York). The corals apparently utilized receptaculitids as a solid substrate for post-larval growth and developed an extremely broad flat base, fixed to the upper surface of Sphaerospongia.

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Campbell, Jocelyn, and Arthur L. Fredeen. "Lobaria pulmonaria abundance as an indicator of macrolichen diversity in Interior CedarHemlock forests of east-central British Columbia." Canadian Journal of Botany 82, no. 7 (July 1, 2004): 970–82. http://dx.doi.org/10.1139/b04-074.

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Orographic precipitation over interior mountains has resulted in the formation of the inland temperate rainforest, where certain stands are potentially antique and support a rich flora of epiphytic macrolichens. We documented macrolichen diversity across three age-classes in forests of the Interior CedarHemlock biogeoclimatic zone (i.e., ICHwk3 subzone) east of Prince George, British Columbia. Our objectives were to report changes in lichen communities with stand age, identify potential indicators of antiquity, and investigate the functional role of dominant species in the ecosystem. We identified 41 taxa, including 4 alectorioid lichens, 21 foliose chlorolichens, and 16 old-growth-associated chlorolichens and cyanolichens. Older forests supported more species than young or mature forests. The abundance of Lobaria pulmonaria (L.) Hoffm. was strongly correlated with this increase in diversity and may therefore be an appropriate indicator of stand age in the ICH. The increase in L. pulmonaria and other N2-fixing cyanolichens with stand age may have significant implications for forest nitrogen budgets in the interior of British Columbia, where atmospheric nitrogen deposition is relatively low and biological N2 fixation accounts for nearly all of the nitrogen lost to forest harvesting. We hope that this greater understanding of lichen ecology across age-classes will promote sustainable stewardship of the remaining old-growth forests of inland British Columbia.Key words: macrolichen diversity, Interior CedarHemlock zone, Lobaria pulmonaria, indicator species, cyanolichens, stand age.

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Phillips, Stephen P., John A. Howell, Adrian J. Hartley, Magda Chmielewska, and Samuel M. Hudson. "Evolution of foreland basin fluvial systems in the mid‐Cretaceous of Utah, USA (upper Cedar Mountain and Naturita formations)." Sedimentology 68, no. 5 (March 17, 2021): 2097–124. http://dx.doi.org/10.1111/sed.12845.

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Kowallis, B. J., and J. Heaton. "Fission-track dating of Upper Jurassic and Lower Cretaceous bentonites from the Morrison, Cedar Mountain, and Mancos Shale Formations of Central Utah." Nuclear Tracks and Radiation Measurements (1982) 10, no. 3 (January 1985): 417. http://dx.doi.org/10.1016/0735-245x(85)90146-2.

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Currie, B. S. "Upper Jurassic-Lower Cretaceous Morrison and Cedar Mountain formations, NE Utah-NW Colorado; relationships between nonmarine deposition and early Cordilleran foreland-basin development." Journal of Sedimentary Research 68, no. 4 (July 1, 1998): 632–52. http://dx.doi.org/10.2110/jsr.68.632.

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Zubareva, Anna M., Vladimir A. Glagolev, and Elena A. Grigorieva. "Characteristics of the spatial and temporal distribution of fire regime in ONE OF the most fire prone Region Of The Russian Far East." GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY 14, no. 2 (July 4, 2021): 74–82. http://dx.doi.org/10.24057/2071-9388-2020-159.

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Wildfires affect the structure and distribution of vegetation all over the globe and have their own specifics in different regions. In this study, we considered the spatial and temporal distribution of fires in the Jewish Autonomous Region (JAR), which is the most fire-prone area of the Russian Far East. Using data from the Department of Natural Resources of the Jewish Autonomous Region, fires and burned areas for more than 40 years were analyzed. The average annual number of fires is near 100, and the average area of one fire is 134 hectares, which is significantly higher compared to other regions of Russia. The largest number of fires and fires with the greatest extent took place in 1975. The intra-annual distribution of fires is bimodal and depends on the climate characteristics of the region. Mapping of burning areas showed that most of the fires occurred near settlements and along roads. The main centers of fire ignition were areas with a large number of small fires (no more than 5 hectares), located within several types of locations: (1) asphalt and dirt roads, railroads and river valleys near settlements; (2) areas of former logging that have several large burned spots of more than 300 hectares; (3) plains with a high concentration of fires over a large region; and (4) small burned spots on the mountain slopes, along the field roads and small rivers. Regions with different degree of fire exposure were identified. Sedge-reed mixed grassy meadows and Agricultural land with shaded meadows are the plant formations most prone to wildfires. At the same time, more fires were detected in Cedar-deciduous forests as well as Oak and black birch forests. The findings are useful for environmental protection agencies in planning fire management strategies, optimizing the fire services and firefighting actions.

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Suarez, M. B., J. A. Knight, A. Godet, G. A. Ludvigson, K. E. Snell, L. Murphy, and J. I. Kirkland. "Multiproxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation." Geological Society, London, Special Publications, August 5, 2020, SP507–2020–85. http://dx.doi.org/10.1144/sp507-2020-85.

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Frederickson, J. A., M. H. Engel, and R. L. Cifelli. "Niche Partitioning in Theropod Dinosaurs: Diet and Habitat Preference in Predators from the Uppermost Cedar Mountain Formation (Utah, U.S.A.)." Scientific Reports 8, no. 1 (December 2018). http://dx.doi.org/10.1038/s41598-018-35689-6.

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Brian S. Currie. "Upper Jurassic-Lower Cretaceous Morrison and Cedar Mountain Formations, Ne Utah-Nw Colordao: Relationships between Nonmarine Deposition and Early Cordilleran Foreland-Basin Development." SEPM Journal of Sedimentary Research Vol. 68 (1998), (1998). http://dx.doi.org/10.1306/d426882e-2b26-11d7-8648000102c1865d.

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