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Dissertations / Theses on the topic 'Morrison-Formation'

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Published: 4 June 2021

Last updated: 14 February 2022

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1

Connely, Melissa V. "Stratigraphy and Paleoecology of the Morrison Formation, Como Bluff, Wyoming." DigitalCommons@USU, 2002. https://digitalcommons.usu.edu/etd/6736.

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The Morrison Formation at Como Bluff, Wyoming, has been historically known for containing a rich source of Late Jurassic vertebrate fossils. However, when collected, most of these fossils were not positioned into a stratigraphic or sedimentologic framework. Research shows that the Morrison Formation at Como Bluff can be divided into three members. These members can be identified by lithologic and paleontological characteristics. The lower Morrison members include the Windy Hill Member and the recently described Lake Como Member. The Windy Hill Member primarily contains near-shore marine sandstone. Megavertebrate fauna is lacking. The Lake Como Member contains illitic clay in red and green mottled paleosols with caliche and thin sandstone beds. The fauna typically consists oflarge saurian and ornithischian dinosaurs. The upper Morrison Formation includes the Talking Rocks Member. This member contains gray-green smectite-rich mudstones. The Talking Rocks Member is generally calcareous and appears to have a megavertebrate fauna similar to the Lower Morrison. The upper part of this member is typically non calcareous and the fauna is more aquatic with turtles, crocodiles, fish and smaller ornithischian dinosaurs, including some species thought to be restricted to the Cretaceous Period. The contact between the Morrison Formation and the overlying Cloverly Formation is placed at the base of the Cloverly conglomerates, which are present throughout the region. In some areas, this boundary coincides with the Jurassic/Cretaceous boundary. However, in sections of the study area, a zone of kaolinitic carbonaceous shale with Cretaceous-like plant material can be found just below the Morrison/Cl overly contact. If this bed is Cretaceous in age, then the Morrison Formation at Como Bluff is in part Early Cretaceous and not restricted to the Late Jurassic.

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2

Greenhalgh, Brent W. "A Stratigraphic and Geochronologic Analysis of the Morrison Formation/Cedar Mountain Formation Boundary, Utah." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1392.pdf.

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3

Robbins, Michael. "Sedimentology and sedimentary tectonics of the Salt Wash Member, Morrison Formation, Western Colorado." Thesis, Boston College, 2009. http://hdl.handle.net/2345/658.

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Thesis advisor: Kenneth G. Galli
Thesis advisor: Noah P. Snyder
The Brushy Basin Member of the Morrison Formation records a time of increased volcanic activity in the North American Cordillera during the Late Jurassic. Sedimentological and petrographic observations in the Brushy Basin, in conjunction with findings of widespread plutonic intrusion in the source areas, point to a volcanic pulse within the Cordilleran magmatic arc. This study investigated the subjacent Salt Wash Member, for the purpose of better constraining the timing of the volcanic pulse. Petrographic and statistical analyses of the Salt Wash sandstone identified statistically significant upsection trends in volcanic rock fragment and plagioclase feldspar at one of the four study areas. The remaining three study areas showed no upsection trends in sandstone composition that would reflect a pulse in volcanism during Salt Wash Member time. It is more likely that the Salt Wash was deposited during a time of volcanic quiescence leading up to the post-Nevadan Orogeny volcanic reactivation. Sedimentology and cementation patterns of the Salt Wash Member were also studied. Cathodoluminescence indicates that the member was well-flushed with shallow formation waters, thus preventing any calcite optical zoning. Luminescence intensity suggests that the Salt Wash Member sediments were cemented at varying depths and within differing Eh-pH regimes. Field-based sedimentological observations support a model of braided stream channel deposition across a semi-arid landscape with streamflow entering the basin from both the south and west
Thesis (MS) — Boston College, 2009
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics

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4

Swan, Alistair Michael. "Quantification of a distributive fluvial system : an example from the Salt Wash unit of the Morrison Formation, Utah." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=239012.

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Fluvial systems and their associated deposits host globally important mineral deposits, water reserves and hydrocarbons. Crucial to the extraction of these resources is an understanding of heterogeneity distribution within deposits of fluvial systems. To constrain and predict heterogeneity distribution within fluvial deposits, outcrop data together with lidar and drone derived virtual outcrop models have been collected from the Salt Wash Distributive Fluvial System (DFS) in Utah and Colorado. The study records an analysis of sedimentary architecture, facies distribution and intra-channel heterogeneity of five study sites within the proximal, medial and distal reaches of the Salt Wash DFS. Specifically the fluvial style, lateral variability of fluvial architecture, intrachannel and overbank ratio, grainsize, channel body and storey width:thickness ratios and intrachannel heterolthics at outcrops considered representative of the proximal, medial and distal portions of a DFS have been documented. Data from the study sites have been used to generate 3D reservoir models. The models have been subject to flow simulation to better understand the significance of hetergenity variability within fluvial reservoirs at an 'inter-well' scale (approximatley 0.1 km2). An indepth workflow and methodology for measuring and describing DFS channel bodies and for the construction of a reservior flow simulation model from outcrop derived data are presented here. Data collection has involved mapping and measuring; palaeocurrents, barscale accretion surfaces, storey dimensions, channel body dimensions, facies and intrachannel heterolithics. Results show clear trends within channel channel bodies and associated deposits such as, intra channel heterogenity channel body percentage, channel body grain size, storey/channel body width thickness; which can be predicted within a distributive fluvial system context, ultimately leading to better subsurface interpretation with smaller datasets. This field based study of the Salt Wash DFS, coupled with virtual outcrop models has provided a quantitive analys's of channel body architectures and facies distributions. Additionally, field work conducted on point bar deposits now illustrates the limitations of 2D outcrops when attempting to describe meandering or braided fluvial deposits and why this may have resulted in gross underestimation of meanderbelt deposits in the fluvial rock record.

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5

Roca, Xavier Argemi. "Tectonic and Sequence Stratigraphic Implications of the Morrison Formation-Buckhorn Conglomerate Transition, Cedar Mountain, East-central Utah." Ohio University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1079297057.

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6

Ejembi, John Idoko. "SEDIMENTOLOGY AND STRATIGRAPHIC EVOLUTION OF THE PARADOX BASIN IN THE MIDDLE-LATE JURASSIC, WESTERN UNITED STATES." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1624.

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The Middle-Upper Jurassic sedimentary rocks (i.e., the Entrada Sandstone, Wanakah Formation, and Morrison Formation) in western Colorado were mostly deposited in the Paradox Basin and form part of the modern-day Colorado Plateau in the Cordilleran foreland region. These rocks were deposited in the Mesozoic during periods of active tectonic processes in western and eastern Laurentia due to the Cordilleran magmatism and continued rifting of Pangaea, respectively. The Middle-Late Jurassic sedimentary record in the Paradox Basin shows rapid transition in depositional environments, pulses in sedimentation, post-depositional alteration, and changes in provenance. This dissertation project utilizes three main scientific tools to address pertinent geologic questions regarding the stratigraphic evolution of these units in the Paradox Basin. U-Pb detrital zircon geochronology of sandstones from these units show local and distal provenance sources. The anisotropy of magnetic susceptibility (AMS) of sediments and rock magnetism attribute the post-depositional alteration to percolation of ferruginous fluids driven by an adjacent regional uplift. Multi-geochemical proxies in paleosols suggest variable redox conditions, and a sub-humid to humid paleoclimate with seasonal precipitation during sedimentary hiatus in the Paradox Basin.

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7

Wilborn, Brooke K. "Two New Dinosaur Bonebeds From the Late Jurassic Morrison Formation, Bighorn Basin, Wy: an Analysis of the Paleontology and Stratigraphy." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35709.

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Vertebrate fossils have been discovered at several locations in the Bighorn Basin (Wyoming). The Virginia Museum of Natural History's (VMNH) digsite is located in the eastern part of the Bighorn Basin, in the Coyote Basin. Many scientists have worked within these basins trying to describe the stratigraphy. One question specifically asked is where the boundary between the Morrison Fm. (Jurassic) and the Cloverly Fm. (Cretaceous) lies. This new study attempted to show if the current method (Kvale, 1986) of determining the boundary is appropriate. The stratigraphy of the area was examined using Kvale, 1986, Ostrom, 1970, and Moberly, 1960's work in order to see which model was more robust. The fossils in the VMNH digsite were used to supplement the stratigraphic data in determining the age of specific beds. All of Ostrom's units were identified throughout the study area. There is some doubt as to whether the units would be acceptable outside of the Coyote Basin because of laterally discontinuity. Nevertheless, his description of units is satisfactory for the study area, and is more appropriate than other methods. The geologic age of the dinosaurs uncovered in the VMNH quarry is in agreement with the age determined stratigraphically. The VMNH site is below Ostrom's Unit II, which would place it in the Late Jurassic. The determination of the Jurassic/Cretaceous stratigraphic boundary has not been resolved. However, since the Pryor Conglomerate member of the Cloverly Fm. can be identified throughout this area, it is proposed as the Morrison Fm./Cloverly Fm. boundary.
Master of Science

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8

VanDeVelde, David Michael. "Interpretation of the depositional environment and paleoclimate of dinosaur sites, Bushy Basin Member of the Jurassic Morrison Formation, east-central Utah." Connect to this title online, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1155136956.

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9

VanDeVelde, David M. "INTERPRETATION OF THE DEPOSITIONAL ENVIRONMENT AND PALEOCLIMATE OF DINOSAUR SITES, BRUSHY BASIN MEMBER OF THE JURASSIC MORRISON FORMATION, EAST-CENTRAL UTAH." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1155136956.

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10

Esker, Donald Anton. "An Analysis of the Morrison Formation’s Terrestrial Faunal Diversity Across Disparate Environments of Deposition, Including the Aaron Scott Site Dinosaur Quarry in Central Utah." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1233009882.

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11

Steiner, Alexis K. "3D Digitization and Wear Analysis of Sauropod Teeth." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1525990888624381.

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12

Holmes, Michele. "The quantum eye looking and identity formation in African-American fiction /." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1483331841&sid=11&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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13

Drew, Shahara Brookins. "Insiders and outsiders : processes of African American canon formation /." View online version; access limited to Brown University users, 2001. http://wwwlib.umi.com/dissertations/fullcit/3006715.

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Thesis (Ph.D.)--Brown University, 2001.
Available in film copy from University Microfilms International. Vita. Thesis advisor: Lewis R. Gordon. Includes bibliographical references (leaves 242-266). Also available online.

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14

Galli, Kenneth Gerard. "Sedimentology and petrology of the Brushy Basin member, Morrison Formation (Late Jurassic), western Colorado." 2003. https://scholarworks.umass.edu/dissertations/AAI3078684.

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The 85-m Brushy Basin Member of the Morrison Formation in western Colorado comprises a 30-m lower division mostly made of red-brown mudstone and a 55-m upper division characterized by variegated smectitic mudstones. River-channel sandstones embedded in the floodplain mudstones tend to have cut down to resistant caliche paleosols. Also present are thin beds of lacustrine micritic limestone and altered silicic ashfalls. These strata were studied at three locations, from west to east: Trail Through Time (TT), Fruita Paleontological Resource Area (FP), and Echo Canyon (EC). Morrison strata developed in a back-bulge depozone of a foreland basin system, with the debris eroded from thrust slices to the west. The Morrison strata differ from many foreland basins because the Morrison-age forebulge deposits west of the preserved basin were eroded due to plateau uplift of eastern Nevada and western Utah. Petrographic modal analyses of 87 sandstones date a major pulse of the Nevadan Orogeny at the transition from the Salt Wash Member to the Brushy Basin Member in late Kimmeridgian time. Brushy Basin sandstones show significant increases upsection in plagioclase, total lithic fragments, and especially volcanic fragments. Abundant volcanic ash accumulated on the floodplains. The source areas for the Morrison Formation were the Ellko and Mogollon Highlands with feldspathic litharenite sands characterized by relatively high proportions of lithic and volcanic fragments and plagioclase. Floodplain red-brown mudstones are highly smectitic with abundant smectite altered from silicic volcanic ash, in both the lower and the upper divisions. Depositional facies and architectural element analysis show that the rivers were low gradient, mainly anastomosing, with perennial flow and seasonal peaks in discharge. Dinosaur bone accumulations are found in some floodplain ponds. Isolated bones are present in anastomosing sandstones at the Trail Through Time. At Fruita Paleontological Resource Area, major acummulations of bones were rapidly buried in the deep pools at three bends in a meandering river.

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15

Kantor, David Chaim. "Stratigraphy and sedimentology of the Upper Brushy Basin Member, Morrison Formation (Jurassic), Eastern Central Utah." 1995. http://catalog.hathitrust.org/api/volumes/oclc/33156507.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1995.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 52-57).

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16

Michelis, Ioannis [Verfasser]. "Taphonomie des Howe Quarry's (Morrison-Formation, Oberer Jura), Bighorn County, Wyoming, USA / vorgelegt von Ioannis Michelis." 2004. http://d-nb.info/973198451/34.

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17

Tschopp, Emanuel. "Evolution of Diplodocid Sauropod dinosaurs with emphasis on specimens from Howe Ranch, Wyoming (USA)." Doctoral thesis, 2013. http://hdl.handle.net/10362/13248.

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Diplodocidae are among the best known sauropod dinosaurs. Several species were described in the late 1800s or early 1900s. Since then, numerous additional specimens were recovered in the USA, Tanzania, Portugal, as well as possibly Spain, England, and Asia. To date, the clade includes about 12 to 15 different species, some of them with questionable taxonomic status (e.g. ‘Diplodocus’ hayi or Dyslocosaurus polyonychius). However, intrageneric relationships of the multi-species, iconic genera Apatosaurus and Diplodocus are still poorly known. The way to resolve this issue is a specimen-based phylogenetic analysis, which was done for Apatosaurus, but is here performed for the first time for the entire clade of Diplodocidae. New material from different localities and stratigraphic levels on the Howe Ranch (Shell,Wyoming, USA) sheds additional light on the evolution of Diplodocidae. Three new specimens are described herein, considerably increasing our knowledge of the anatomy of the group. The new specimens (SMA 0004, SMA 0011, and SMA 0087) represent two, to possibly three new diplodocid species. They preserve material from all parts of the skeleton, including two nearly complete skulls, as well as fairly complete manus and pedes, material which is generally rare in diplodocids. Thereby, they considerably increase anatomical overlap between the sometimes fragmentary holotype specimens of the earlier described diplodocid species, allowing for significant results in a specimenbased phylogenetic analysis. Furthermore, clavicles and interclavicles are identified, the latter for the first time in dinosaurs. Their presence seems restricted to early sauropods, flagellicaudatans, and early Macronaria, and might thus be a retained plesiomorphy, with the loss of these bones being synapomorphic for Titanosauriformes and possibly Rebbachisauridae. The new material allows to test previous hypotheses of diplodocid phylogeny. In order to do so, any type specimen previously proposed to belong to Diplodocidae was included in the study, as are relatively complete referred specimens, in order to increase the degree of overlapping material. For specimens subsequently suggested to be non-diplodocid sauropods, their hypothesized sister taxa were included as outgroups. The current phylogenetic analysis thus includes 76 operational taxonomic units, 45 of which belong to Diplodocidae. The specimens were scored for 477 morphological characters, representing one of the most extensive phylogenetic analyses done within sauropod dinosaurs. The resulting cladogram recovers the classical arrangement of diplodocid relationships. Basing on a newly developed numerical approach to reduce subjectivity in the decision of specific or generic separation, species that have historically been included into well-known genera like Apatosaurus or Diplodocus, were detected to be actually generically different. Thereby, the famous genus Brontosaurus is resuscitated, and evidence further suggests that also Elosaurus parvus (previously referred to Apatosaurus) or ‘Diplodocus’ hayi represent unique genera. The study increases our knowledge about individual variation, and helps to decide how to score multi-species genera. Such a specimen-based phylogenetic analysis thus proves a valuable tool to validate historic species in sauropods, and in paleontology as a whole.
Fundação para a Ciência e a Tecnologia - (SFRH / BD / 66209 / 2009)

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18

Barros, André de Sousa Saleiro. "Upper Jurassic dinosaur bonebeds at Ten Sleep, Wyoming: stratigraphy, preliminary results and field reports of 2016 and 2017." Master's thesis, 2018. http://hdl.handle.net/10362/58235.

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The Upper Jurassic Morrison Formation that outcrops throughout the Western Interior of the United States is well known for its diverse environments and for its vertebrate, invertebrate and floral biodiversity, in great part fueled by the numerous paleontological expeditions focused on extensive fossil record of the formation’s dinosaurian fauna, since late 19th century. In 2014, plans started to be made for a new expedition into the Morrison Fm. outcrops close to the town of Ten Sleep, where digs have been carried out in private land since 2006. This expedition represented the return of the American Museum of Natural History (AMNH) to the Big Horn Basin since Barnum Brown’s Howe Ranch expedition in the early 1930s, however this time, work would be under taken in public land. As such, a project was submitted to the Bureau of Land Management in order to obtain permission to dig and survey two distinct localities between the towns of Ten Sleep and Hyattville: Cosm and Dana quarries. The expedition counted with elements from AMNH and Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa (FCT-UNL), and was carried out between the months of August and September, of 2016 and 2017. At the end of two years, the yellowish to tan massive cross bedded sandstones that outcrop along the hills of the Ten Sleep-Hyattville area, have proven to rich fossiliferous riverbank deposits, both in quantity and diversity, mainly preserving dinosaurian remains (some preserving cranial elements) representative of the upper levels of the Morrison Fm. such as Allosaurus sp., Apatosaurus sp., Camarasaurus sp., and unidentified diplodocids, ornithopods, and stegosaurid. This information, along newer stratigraphical data for the area, and the detailed description of the digging season, are here reported as to record the first steps taken in what is to be a long term project.

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