Download or read book Paleoenvironmental Reconstruction of the Late Cretaceous Maastrichtian Prince Creek Formation Near the Kikaktegoseak Dinosaur Quarry North Slope Alaska written by Erik Brandlen and published by . This book was released on 2008 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: "During 2005, sedimentological fieldwork was conducted, and bulk sediment samples were taken for paleopedological, paleopalynological and paleoenvironmental analysis of the Prince Creek Formation, near the Kikak-Tegoseak dinosaur quarry, North Slope, Alaska. This work is a detailed description of those outcrops. The outcrops are interpreted as an anastomosed crevasse-splay complex similar to the modem Cumberland Marshes area, Saskatchewan River, Canada and the Cretaceous Dakota Formation, Wyoming. Frequent avulsions and flooding of the splay channels reflect a history of rapid sedimentation that inhibited paleosol development and may have contributed to the preservation and fossilization of large numbers of dinosaur bones. Drab paleosol colors indicate gleyed conditions related to soil saturation. However, micromorphological features, microenvironments related to vegetation and the abundance of charcoal, indicate periods of drier conditions. The paleoenvironment was one of a seasonally wet splay complex, with small, shallow, anastomosed splay channels, aggrading levees, incipient soils, wetlands and ephemeral ponds. Taxodiaceae, Pinaceae, ferns and tree ferns dominated the vegetation, but angiosperms were rare. The paleoclimate was cool temperate, with a seasonal precipitation regime. No evidence of freezing conditions was found despite the paleogeographic location high above the Cretaceous Arctic Circle"--Leaf iii.
Download or read book Depositional Environments of the Late Cretaceous Maastrichtian Dinosaur bearing Prince Creek Formation written by Peter Paul Flaig and published by . This book was released on 2010 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Prince Creek Formation contains first-order meandering trunk channels, second order meandering distributary channels, third-order fixed anastomosed(?) distributary channels, crevasse splays, levees, lakes, ponds, swamps, paleosols, and ashfall deposits. Trampling by dinosaurs is common. Most deposition occurred on crevasse splay-complexes adjacent to trunk channels. Rhythmically-repeating coarse-to fine-grained couplets in inclined heterolithic stratification suggest tidal-influence in channels. Cumulative to compound soils similar to Entisols, Inceptisols, and potential acid sulfate soils formed on levees, point bars, crevasse splays, and on the margins of lakes and swamps. Frequent overbank flooding is evidenced by silt and sand dispersed throughout paleosol profiles and fluctuations with depth in several molecular ratios. Drab colors, organics, siderite, depletion coatings, and zoned peds indicate waterlogged, anoxic conditions while ferruginous and manganiferous features, insect and worm burrows, and rare illuvial clay coatings and infillings suggest drying and oxidation of some soils. Repeated wetting and drying is tied to fluctuating river discharge. Marine influence is evidenced by jarosite, pyrite, and gypsum which become increasingly common up-section near the contact with the shallow-marine Schrader Bluff Formation. Recovered biota include Peridinioid dinocysts; algae; projectates; Wodehouseia edmontonicola; pollen from lowland trees, shrubs and herbs; Bisaccates; fern and moss spores; and fungal hyphae and indicates that all strata are Early Maastrichtian and that sediments become progressively younger from measured section NKT in the south to measured section LBB in the north. 40Ar/39Ar analysis of a tuff returned an age of 69.2 ± 0.5 Ma in the Sling Point outcrop belt. World-class dinosaur bonebeds are encased in muddy overbank alluvium overlying floodplains. No concentration of bone was found in channels. Bonebeds are laterally extensive except where truncated by distributaries. At the Sling Pont, Liscomb, and Byers bonebeds alluvium encasing bone exhibits a bipartite division of flow and a massive mudstone fades containing flow-parallel plant fragments that 'float' in a mud matrix suggesting deposition by fine-grained hyperconcentrated flows. Exceptional floods driven by seasonal snowmelt in the Brooks Range increased suspended sediment concentrations, generating hyperconcentrated overbank flows that killed and buried scores of juvenile dinosaurs occupying this high-latitude coastal plain. This unique killing mechanism likely resulted from fluctuating discharge tied to seasonality brought about by the near polar latitude of northern Alaska in the Late Cretaceous"--Leaves iii-iv.
Download or read book A New Tolypella from the Ocean Point Dinosaur Locality North Slope Alaska and the Late Cretaceous to Paleocene Nitelloid Charophytes written by Monique Feist and published by . This book was released on 1991 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multidisciplinary approach to research studies of sedimentary rocks and their constituents and the evolution of sedimentary basins, both ancient and modern.
Download or read book Vertebrate Ichnology and Paleoenvironmental Associations of Alaska s Largest Dinosaur Track Site in the Cretaceous Cantwell Formation Maastrichtian of Denali National Park and Preserve written by Dustin G. Stewart and published by . This book was released on 2020 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Upper Cretaceous Cantwell Formation in Denali National Park and Preserve (DENA) has recently been recognized as a major high latitude dinosaur track-bearing unit in Alaska. The abundant trace fossil record of the Cantwell Formation, which represents a diverse community of avian and non-avian dinosaurs, compliments the body fossil record of the state’s other major dinosaur-producing unit, the Prince Creek Formation of northern Alaska. However, research in the Cantwell Formation is still in its infancy due to its wide aerial extent and remoteness, and many questions remain concerning the temporal, ichnological, and paleoenvironmental relationships of the formation. Here I describe and analyze the largest known single track site currently known in DENA and all of Alaska — a football field-sized outcrop named the Coliseum. This site is composed of 65+ meters of vertical section, with laterally extensive fine- to medium-grained sandstone, indurated mudstone, fissile shale, and bentonite. Trace fossils at the Coliseum include true tracks, undertracks, natural casts, and trackways that vary in their preservation from eroded, trampled surfaces to individual prints with skin impressions. The tracks were documented via handheld and UAV-assisted photogrammetry, enabling a large-scale 3-dimensional mapping of the Coliseum. Facies analysis of the site reveal the tracks were formed on crevasse splay and overbank deposits within a fluvial floodplain. U-Pb dating of zircons collected from a bentonite horizon return an age of 69.3±0.9 Ma (early Maastrichtian), improving the temporal constraints of the formation and revealing one of the youngest ages of deposition for the formation. Several new dinosaurian ichnotaxa previously unrecognized from the formation are described, revealing the presence of large-bodied ornithopods, ceratopsids, and non-avian and avian theropod trackmakers. The Coliseum provides a snapshot of an ancient forested environment inhabited by a diverse dinosaurian community deposited in the Late Cretaceous paleo-Arctic.
Download or read book Stratigraphy and Facies of Cretaceous Schrader Bluff and Prince Creek Formations in Colville River Bluffs North Slope Alaska written by Romeo M. Flores and published by . This book was released on 2007 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoclimate and Paleoenvironment of the Prince Creek and Cantwell Formations Alaska written by Susana Salazar Jaramillo and published by . This book was released on 2014 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Twenty two Measured Sections of Cretaceous Lower Tertiary Rocks Eastern North Slope Alaska written by and published by . This book was released on 1984 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoenvironmental Reconstruction of the Late Cretaceous Eastern Gulf Coastal Plain in Georgia and Alabama written by Tracy L. Hall and published by . This book was released on 2005 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoenvironmental Analysis of Cretaceous Mudstones at Slope Mountain Alaska Using Carbon Stable Isotopes written by Ashley Ratigan and published by . This book was released on 2016 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project uses field samples, microfacies analysis, and carbon stable isotopes of mudstones to determine past environmental conditions of North Slope, Alaska during the Albian-Cenomanian (Cretaceous). Samples were taken at Slope Mountain, Alaska located north of the Brooks Range. Slope Mountain includes the Torok Formation and the upper and lower Nanushuk Formations that consist of alluvial, deltaic, and shallow marine facies that were deposited into the North Slope foreland basin on the Arctic Alaska micro plate. An exhaustive search for identifiable microfossils, such as pollen, diatoms, and foraminifera in the samples yielded nothing but charcoal and carbon residue. No other fossilized material was identified. Carbon stable isotope values are consistent with a mix of algae and terrestrial plants, suggesting deposition in a shallow marine setting close to shore.
Download or read book STRATIGRAPHIC GEOGRAPHIC AND PALEOECOLOGICAL DISTRIBUTION OF THE LATE CRETACEOUS SHARK GENUS PTYCHODUS WITHIN THE WESTERN INTERIOR SEAWAY NORTH AMERICA written by SHAWN A. HAMM and published by New Mexico Museum of Natural History and Science. This book was released on 2020-01-01 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Paleoenvironmental Reconstruction of the Cretaceous Willow Creek Anticline Dinosaur Nesting Locality written by William Morris Bauer Gavin and published by . This book was released on 1986 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparative Taphonomy and Paleoecological Reconstruction of Two Microvertebrate Accumulations from the Late Cretaceous Hell Creek Formation Maastrichtian Eastern Montana written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Depositional Environments and Processes in Upper Cretaceous Nonmarine and Marine Sediments Ocean Point Dinosaur Locality North Slope Alaska written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Taphonomy Geology and Paleoecology of the Sandy Site an Exceptional Assemblage in the Maastrichtian Hell Creek Formation of South Dakota written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sandy Site is a multispecific terrestrial deposit in the fluvial sediments of the Upper Cretaceous Hell Creek Formation. It captures a diversity of Late Cretaceous dinosaurs and other vertebrates. Over three thousand bones represent at least fifty genera of birds, pterosaurs, terrestrial and aquatic tetrapods, and fish. Ten of the eleven dinosaur families found throughout the formation have been recognized at this quarry. Detailed taphonomic observations included abrasion, bone completeness, skeletal representation. These and a number of qualitative features indicated two distinct bonesets in the assemblage. An allochthonous suite included bones of tyrannosaurs, hadrosaurs and ceratopsians, which possessed taphonomic signatures similar to exotic aquatic vertebrate specimens. Smaller, unusual dinosaurs comprised a parautochthonous group with mammals, birds, pterosaurs, and small herpetofauna. Sedimentologic data suggest a fluvial crevassing event as the most likely depositional setting. Crevasse channel deposition fits with the Sandy microstratigraphic package and structures present, the narrow time resolution, and the dual nature of the taphocoenosis. A direct cause of mortality cannot be identified, but that agent and the subsequent burial of the taphocoenosis apparently occurred in two steps. Comparison with other sites indicates that Sandy was a product of fortuitous set of repeatable events, and that similar depositional environments produce mixed assemblages with multispecific parautochthonous components. The autochthonous assemblage presents a Sandy paleofauna different from conventional reconstructions of the Hell Creek Formation. Smaller dinosaurs prevailed in this setting, in marked contrast to the dominance of a few megafaunal taxa presented in previous reconstructions. The original faunule has a size structure similar to modern mammal communities. The regional ecology may have been mosaic rather than homogeneous, where large dinosaurs lived near but s.
Download or read book Depositional Facies Petrography and Reservoir Potential of the Fortress Mountain Formation Lower Cretaceous Central North Slope Alaska written by Geological Survey (U.S.) and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoenvironments of Vertebrate bearing Strata at the Cretaceous Paleogene Boundary in Northeastern Montana and Southwestern North Dakota written by David Eliot Fastovsky and published by . This book was released on 1986 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Upper Cretaceous Palynofacies Vegetation and Climate of the North Slope Alaska written by Warren James Lewis and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
