Global ETD Search
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Showing 1 to 18 of 18 for “"Upper Triassic"”.
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Fluvial sequence stratigraphy and paleoclimate of the Upper Triassic (Norian-Rhaetian) Chinle Strata, northern New Mexico.
Two age-equivalent Upper Triassic (Norian and Rhaetian) fluvial successions in New Mexico were evaluated from a sequence-stratigraphic and paleopedologic perspective. Meter-scale fining-upward fluvial aggradation cycles (FACs) comprise fluvial aggradational cycle sets (FACSETs) 4-15 m thick. …
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UPPER TRIASSIC CORALS AND CARBONATE REEF FACIES FROM THE MARTIN BRIDGE AND HURWAL FORMATIONS, WALLOWA TERRANE (OREGON)
The diversity and abundance of Late Triassic scleractinian corals and carbonate microfacies were analyzed from the Wallowa terrane (southern Wallowa Mountains, Oregon) in order to determine regional and distant paleogeographic relationships during the Late Triassic time. Systematic identification …
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UPPER TRIASSIC CORALS AND CARBONATE REEF FACIES FROM THE MARTIN BRIDGE AND HURWAL FORMATIONS, WALLOWA TERRANE (OREGON)
The diversity and abundance of Late Triassic scleractinian corals and carbonate microfacies were analyzed from the Wallowa terrane (southern Wallowa Mountains, Oregon) in order to determine regional and distant paleogeographic relationships during the Late Triassic time. Systematic identification …
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Provenance, redox conditions, and diagenesis of shales in Chang 7 member of Upper Triassic Yanchang Formation, Ordos Basin, China
… burial history of shales in Chang 7 Member of Upper Triassic Yanchang Formation, Ordos Basin, China. The first paper discusses the origins of single-channeled, vertical, sinuous, and calcite-bitumen-filled cracks in the shales. Results show that in early diagenesis, unconsolidated mud was …
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Piecing Together the Triassic/Jurassic Stratigraphy Along the South Flank of the Uinta Mountains, Northeast Utah: A Stratigraphic Analysis of the Bell Springs Member of the Nugget Sandstone
<p>Nomenclature for the Upper Triassic and Lower Jurassic strata along the south flank of the Uinta Mountains has been somewhat confusing because of the position of the study area between southern Wyoming, where one set of names is used, and central/southern Utah where a different set of formation …
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The sedimentology and petrology of the new red sandstone of the Elgin Basin, North East Scotland
… the basin at Elgin, deposition began during the Upper Permian with a series of sheetflood deposits which graded laterally into seif dunes to the north. Deposition during the Triassic is dominated by aeolian barchan dunes although minor point bar, playa and floodplain deposits were' present. A …
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The Post Triassic uplift and erosion history of the Southwestern UK
… region have been subject to widespread post-Triassic exhumation, the timing, magnitude and causes of which are debated. Exhumation of up to 6km (but more generally ≤3km) has been shown to have affected the Western UK Continental Shelf. This region contains a series of intra-plate extensional …
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Revision and description of Keuper (Middle Ladinian to Rhaetian) invertebrate trace fossils from the southern part of the Germanic Basin and studies of related material
The invertebrate trace fossils from the Keuper (Upper Triassic) of the southern part of the Germanic Basin are revised. The Keuper sediments of the Germanic Basin are predominantly composed of rocks representing various nonmarine environments dominated by red-bed facies. The Würzburg Formation, the …
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From grains to tracks: high-resolution sedimentology of track-bearing Stormberg strata, southern Africa
… dramatic variations in track morphology. In the upper Stormberg Group, main Karoo Basin of southern Africa, diverse trace fossils, primarily comprising Upper Triassic– Lower Jurassic dinosaur tracks, are preserved. Extensive studies have been carried out to document these individual tracksites …
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Magnetic records from latest Triassic to earliest Jurassic red beds, Utah and Arizona, and from mid-Pleistocene lake beds, New Mexico
Paleomagnetic data obtained from the Upper Triassic to Lower Jurassic strata of the Moenave Formation, southern Utah and northern Arizona, were used to construct a composite magnetostratigraphy and further refine the position of the base of the Jurassic in the southwest U.S.A. The composite …
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Structure, evolution, and petroleum potential of the Queen Charlotte Basin
… Queen Charlotte Sound. Source rocks occur in the Upper Triassic-Lower Jurassic interval, and reservoirs in the Cretaceous units. Tertiary rocks form a regional seal. The Hecate Strait area lacks thick Mesozoic rocks, but the Queen Charlotte Sound area contains Mesozoic source and reservoir rocks, …
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Facies patterns and controls on sedimentation in the Triassic Chinle formation of Northeast New Mexico
The middle sandstone member of the Upper Triassic Chinle Formation in northeastern New Mexico consists of ephemeral-stream deposits adjacent to the Ancestral Rocky Mountain uplift and perennial braided-stream deposits on the plains to the east. The two fluvial systems were contemporaneous with the …
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Description of Tanytrachelos ahynis and its implications for the phylogeny of Protorosauria
… small (21 cm long) aquatic protorosaur from the Upper Triassic sediments in the Cow Branch Formation of the Newark Supergroup, has been briefly described in 1979 by P. E. Olsen. A growing addition of nearly 200 specimens and the availability of CT imaging allow for an extensively detailed …
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Structural and stratigraphic relationships between the Numidien formation and underlying formations in the westernmost Mogod Mountains, northern Tunisia
… in the westernmost Mogods overlies a sequence of Upper Cretaceous to Eocene limestones and marls which exhibit a shallowing event beginning prior to the lowermost Eocene. Water depths of deposition based on faunal assemblages indicate that the Upper Cretaceous limestones and marls were deposited …
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Evaluation of tridactyl theropod tracks in southern Africa: quantitative morphometric analysis across the Triassic–Jurassic boundary
… steadily increased from the Carnian to the Triassic booming soon after the end Triassic Mass-Extinction event (ETE), marking a key period in archosaur history. In southern Africa, the Triassic–Jurassic Boundary (TJB) is contained in the richly fossiliferous, fluvio-lacustrine-aeolian Upper …
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Rise of present-day tetrapods in the paleotropics of Late Triassic equatorial Pangaea: new insights from microvertebrate data
The Triassic Period (~252–201.5 Ma) saw a transformative radiation and reorganization of continental tetrapod diversity following the end-Permian Extinction, including an assemblage of diverse forms that do not survive the end-Triassic (herein termed the 'endemic Triassic fauna', =ETF), as well as …
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Integrating morphological data from fossil and living species and the early evolution of ray-finned fishes (Actinopterygii)
… My second chapter describes a new species of the Triassic ray-finned fish Saurichthys from newly collected material in the Upper Triassic Dockum Group of northwest Texas. This description is a launching point to discuss using disarticulated microvertebrate actinopterygian remains to inform our …
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Natural arsenic and uranium accumulation and remobilization in different geological environments
… on groundwater extraction from terrestrial Upper Triassic sandstones where elevated concentrations of geogenic U and As exceeding German drinking water limitations were identified. Characterization of aquifer material in terms of geochemical and mineralogical composition, trace elements …