Download or read book Alluvial Facies and Paleosols in the Cretaceous Nanushuk Formation Kanayut River North Slope Alaska written by Paul J. McCarthy and published by . This book was released on 2003 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Facies Analysis and Sedimentology of Cretaceous Nanushuk Formation at Slope Mountain Alaska written by Kevin K. Gardner and published by . This book was released on 2016 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of sedimentary lithologies and structures in selected outcrop sites at Slope Mountain, Alaska identified thirteen distinct facies within a subsample of the Cretaceous (Albian-Cenomanian) Nanushuk Formation. Based on the distribution of the thirteen facies, this study defines five unique facies associations at Slope Mountain, each representing a specific depositional environment. The facies associations are as follows: 1) distributary channel bar, 2) tidal channel, 3) upper shoreface, 4) distributary mouth bar, and 5) fluvial channel. The relative stratigraphic positions of the facies associations in outcrop have implications for fluctuations in shifting shoreline positions within the Nanushuk Formation over time. The progression of facies associations within several hundred meters of section analyzed in this study depict a shift from a regressive deltaic system (sedimentation>accommodation) to an alluvial system affected by local transgression (sedimentationaccommodation). Despite significant overall accommodation in the Colville basin, the dominant pattern of Nanushuk Formation sedimentation is highly regressive, with significant progradation and aggradation of deltaic and alluvial deposits throughout the Albian-Cenomanian.
Download or read book Geology of the Nanushuk Group and Related Rocks North Slope Alaska written by A. C. Huffman and published by . This book was released on 1985 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Architectural Analysis and Fold Geometry of Syntectonic Fluvial Conglomerate in the Nanushuk Formation Brooks Range Foothills Alaska written by Emily Suzanne Finzel and published by . This book was released on 2004 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The fluvial style and syntectonic deposition of conglomerate in the upper part of the Nanushuk Formation are resolved using facies architectural analysis and structural geometry. Along the Kanayut River in the northern foothills of the Brooks Range, Alaska, fluvial conglomerate is exposed as benches on the north and south flanks of the Arc Mountain anticline. Photo mosaics of each bench on the north side, along with thirty-three detailed measured sections, were used to evaluate facies architecture. Eight lithofacies were described that characterize six facies associations including longitudinal and transverse gravel bars, diffuse gravel sheets, sediment gravity flow deposits, crevasse splay and floodplain deposits, and scour fills of a gravel-bed braided river. Strata on the south limb of the anticline show characteristics of syndeformational deposition during the growth of the south limb of the Arc Mountain anticline. These structural data provide new evidence for syndepositional contractional deformation during the mid-Cretaceous at this locality in the northern foothills of the Brooks Range. These results provide clues to the character and extent of potential reservoir rocks from the Nanushuk Group that are present in the subsurface of the National Petroleum Reserve in Alaska, which is important for continued recovery of natural resources on the North Slope"--Leaf iii.
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 Biennial Report written by University of Alaska Fairbanks. Geophysical Institute and published by . This book was released on 2003 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentology and Stratigraphy of the Nanushuk Formation and Related Foreland Basin Deposits Central Brooks Range Foothills Alaska written by Grant Shimer and published by . This book was released on 2013 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: I interpret sedimentary facies and depositional environments from the Albian-Cenomanian Nanushuk Formation of Alaska's North Slope from sedimentary structures observed in core samples and in outcrop in the National Petroleum Reserve - Alaska (NPRA) and surrounding areas, and support these interpretations with supplemental analyses of geophysical well logs and 40Ar/39Ar dating of volcanogenic deposits. The results have implications for the reservoir characterization of a shallow, frozen oil field at Umiat, Alaska, and for interpretations of the Colville foreland basin. In the central Brooks Range foothills the Nanushuk Formation comprises shallow marine and non-marine fades associations that can be grouped into marine-distributive and river-distributive systems. In wells at Umiat, Alaska, shoreface and wave-influenced deltaic sandstones (marine-distributive systems) occur at the base of the Nanushuk Formation, followed by a marine transgression and subsequent progradation of a delta complex (river-distributive system). The shift from marine-distributive to river-distributive systems is related to shelf building processes during the Albian-Cenomanian. Marine-distributive systems occurred at or near the shelf edge in a high-energy coastal environment, whereas river-distributive systems rapidly prograded over the shallow Nanushuk shelf following transgression. Marine-distributive conditions resumed when rapidly progradational river-distributive systems reached the shelf edge. This pattern occurs in the Umiat, Wolf Creek, and Grandstand No. 1 subsurface wells. The reservoir quality of the Nanushuk Formation varies strongly with facies. Well-sorted sandstones at the top of upward-coarsening successions in both marine- and river-distributive units have the highest permeabilities within the Nanushuk Formation. Marine-distributive units have low permeability anisotropy in contrast to river-distributive units due to better sorting in wave-influenced environments and the higher frequency of impermeable lamination surfaces in deltaic sandstones. Despite coarser grain size and similar depositional environments as lower Nanushuk Formation sandstones, transgressive units at the top of the Nanushuk Formation have low permeability, probably due to the presence of calcite cement. These results suggest hat the highest quality Nanushuk Formation reservoirs most likely occur in time transgressive, regionally extensive marine-distributive sandstones of the lower Nanushuk Formation.
Download or read book Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1985 with total page 392 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 Measured Sections of the Cretaceous Nanushuk Group Undivided Western North Slope Alaska written by A. C. Huffman and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Architectural Analysis of Fluvial Conglomerate in the Nanushuk Formation Brooks Range Foothills Alaska written by Emily Suzanne Finzel and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this report is to present the results of a sedimentological study of Aptian-to Albian-age Nanushuk Formation rocks along the north limb of the Arc Mountain anticline at the Kanayut River, Alaska. The goal of this study is to define and interpret lithofacies and architectural elements for the conglomerate in the study area, and then use these interpretations to suggest a fluvial model for the river that deposited the conglomerate.
Download or read book Depositional facies petrography and reservoir potential of the Fortress Mountain Formation Lower Cretaceous central North Slope Alaska written by C. M. Molenaar and published by . This book was released on 1981 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Petrology Depositional Setting and Reservoir Quality of the Torok Nanushuk Transition Central North Slope Alaska written by Russell Kirkham and published by . This book was released on 2005 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Cretaceous sandstones of the upper Torok and lower Nanushuk formations were deposited in a storm-dominated, deltaic depositional system during filling of the Colville basin, North Slope, Alaska. This study focuses on distal shelf and slope sandstones of the Torok Formation and shoreface sandstones of the Nanushuk Formation from Arc Mountain, Slope Mountain, Gunsight Mountain, and the Grandstand Test Well. Ten lithofacies were identified at these locations. Facies associations define depositional environments ranging from deep marine debris flows and tubidites deposited in distal shelf and slope settings of the Torok Formation to deposition of hummocky cross-stratified sandstones deposited above storm wave base in the proximal shelf settings of the Torok/Nanushuk transition. Sandstones from these locations are fine grained and include abundant detrital grains of quartz, chert, various lithic fragments, and feldspar. Compositionally these sandstones plot as litharenites to sublitharenites and are derived from a quartzose to transitional recycled orogenic provenance. These sandstones record the uplift of the ancestral Brooks Range and exhumation of the Endicott Mountain allochthon. There is a decrease in lithic material from the deeper water outer shelf setting to the storm dominated shoreface setting that is attributed to increased reworking and winnowing by waves in the higher-energy, shallow water settings"--Leaf iii.
Download or read book Assessment of Undiscovered Oil and Gas Resources in the Cretaceous Nanushuk and Torok Formations Alaska North Slope and Summary of Resource Potential of the National Petroleum Reserve in Alaska 2017 written by David W. Houseknecht and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
