Download or read book Evolution and Architecture of an Incised Valley in the Upper Cretaceous Eagle Formation in South central Montana written by Neal Auchter and published by . This book was released on 2012 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Santonian-Campanian Eagle Formation in south-central Montana is composed of a series of exceptionally well preserved regressive-transgressive cycles deposited on the western margin of the Cretaceous Interior Seaway. This study focuses on the genesis of a regionally correlative basal incision surface and the subsequent fill architecture of the informal middle member of the Eagle Formation. Three stratigraphic surfaces are traced continuously for up to 15 km and include the regressive surface of marine erosion (RSE), sequence boundary (SB), and transgressive surface of tidal-fluvial erosion (TSE). Within this sequence stratigraphic framework, 4 facies association, internal lower-order architectures (i.e. channel forms, lateral accretion sets, crevasse splays) and higher-order regional surfaces (i.e. sequence boundaries) are used to establish a three-phase depositional history of valley evolution: 1) fluvial incision during decreasing accommodation concomitant with fluvial deposition and sediment storage on abandoned terraces within the valley, 2) rapid increase in accommodation significantly outpaced sediment influx concurrent with seasonal fluctuations in fluvial discharge and landward migration of the turbidity maximum, producing a flood-dominated mud-rich central valley deposit, and 3) deceleration in the rate of relative sea level rise marked by a depositional shift to tidally influenced fluvial deposition, extensive valley widening, and coal development. The resulting valley architecture is a highly diachronous composite basal incision surface. The time-transgressive multi-phase nature of valley formation and infilling produced a fill profile with a mud-rich valley center flanked by stacked, sand-rich fluvial and tidal-fluvial deposits toward the valley margins. These findings contribute to the sequence stratigraphic interpretation of incised valleys along the Late Cretaceous Western Interior Seaway, serve as an outcrop analog for potential incised valley reservoirs, and have direct application in developing reservoir models for the Eagle Formation in south-central Montana and elsewhere.
Download or read book Internal Facies Architecture of a Regressive to Transgressive Wave dominated Delta in the Upper Cretaceous Eagle Formation South central Montana written by Eleanor Spangler and published by . This book was released on 2012 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Santonian-Campanian Eagle Formation in south-central Montana was deposited along the western margin of the Cretaceous Western Interior Seaway and is composed of a series of well preserved regressive and transgressive deposits. This study documents the depositional evolution of the informal lower member of the Eagle Formation exposed near Billings, MT. Detailed mapping and characterization of the internal stratigraphy, facies architecture, and bounding surfaces of the lower Eagle provide the basis for reconstruction of a paleodelta system that serves as a valuable reservoir analog within the Cretaceous Seaway and elsewhere. This study demonstrates that the informal lower member of the Eagle Formation in south-central Montana was deposited in a regressive to transgressive wave-dominated deltaic system. Within this deltaic succession the identification of five facies and four bounding surface types are used to establish a two-phase depositional history: 1) a regressive phase characterized by prograding pro-delta to distal delta front deposits emplaced below fair weather wave base but above storm wave base; and 2) a transgressive phase characterized by landward dipping proximal to distal shoal overwash fan deposits derived from combined-flow storm-generated turbidity currents. A maximum regressive surface (MRS) separates underlying prograding deltaic deposits from downlapping shoal overwash fan deposits above. Shoal overwash fan packages dip and stack en-echelon towards the paleoshoreline indicating landward migration of the shoal during delta transgression. A time-transgressive ravinement surface (TRS) developed on the basinward side of the transgressive shoal and migrated landward with the shoreline, truncating of shoal overwash fan deposits.
Download or read book Depositional Factors of the Upper Cretaceous Eagle Formation South central Montana written by Norman Keith Olson and published by . This book was released on 1961 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions to Late Cretaceous Stratigraphy and Paleontology Western Montana written by T. S. Dyman and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Tectonic Implications of Upper Cretaceous Rocks in the Powder River Basin Northeastern Wyoming and Southeastern Montana written by Edward Allen Merewether and published by . This book was released on 1996 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multidisciplinary approach to research studies fo sedimentary rocks and their constituents and the evolution of sedimentary basins--both ancient and modern.
Download or read book Sequence Stratigraphy of the Cretaceous Eagle Sandstone in the Vicinity of Billings Montana written by Mark S. Hanson and published by . This book was released on 1991 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Incised Valley fill System Development and Stratigraphic Analysis of the Lower Cretaceous Kootenai Formation Northwest Montana written by Casey Ryan Reid and published by . This book was released on 2015 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lower Cretaceous Kootenai Formation in northwestern Montana records some of the first deposition of siliciclastic sediment into the Cordilleran foreland basin system. These rocks are also of particular interest due to their viability as reservoirs for hydrocarbons. The delineation of incised valley-fill systems within in this stratigraphic interval is of specific importance to this study as these stratigraphic entities have proven to record significant changes in base level fluctuations as well as preserving productive reservoir facies. For this study a densely spaced collection of well logs, limited core, and analogous outcrop exposures were used to investigate the Cretaceous Kootenai Formation. The specific objectives of this research are three fold: (1) construct a regional stratigraphic framework of the Kootenai Formation and immediately adjacent strata in order to reconcile lithostratigraphic and chronostratigraphic units, (2) utilize the framework to delineate the stratigraphic position and architecture of local-scale incised valley-fill systems, and (3) construct a valley-fill model that incorporates environments of deposition interpreted from the observation of lithofacies in core and analogous outcrop. The stratigraphic analysis revealed a classic non-marine to marginal marine depositional sequence (Mitchum et al., 1977) within the Kootenai Formation. A sequence boundary at the base of the depositional sequence separates highstand marine strata of the Jurassic Ellis Group from lowstand incised valley-fill strata of the basal Sunburst member of the Kootenai Formation. Within the Lower Cretaceous depositional sequence, four distinct depositional environments stack to form the lowstand, transgressive, and highstand systems tract following fluvial incision into underlying Jurassic highstand strata. The first depositional environment is remnant amalgamated fluvial channel sandstone with pebble mud-clast lags. As base level began to rise a transgressive estuarine system developed. A transgressive surface is interpreted where incised valley-fill caps the valley. A lateral shift in depositional environments led to deposition of mud and fine-grained sand interpreted to represent tidal mud flats. Finally, as the rate of base level rise slowed an alluvial plain system developed, which marked the onset of the highstand systems tract.
Download or read book Recent Advances in Models of Siliciclastic Shallow marine Stratigraphy written by Gary J. Hampson and published by SEPM Soc for Sed Geology. This book was released on 2008 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Siliciclastic shallow-marine deposits record the interface between land and sea, and its response to a variety of forcing mechanisms: physical process regime, the internal dynamics of coastal and shelfal depositional systems, relative sea level, sediment flux, tectonic setting, and climate. These deposits have long been the subject of conceptual stratigraphic models that seek to explain the interplay between these various forcing mechanisms, and their preservation in the stratigraphic record. This volume arose from an SEPM research conference on shoreline-shelf stratigraphy that was held in Grand Junction, Colorado, on August 24-28, 2004. The aim of the resulting volume is to highlight the development over the last 15 years of the stratigraphic concepts and models that are used to interpret siliciclastic marginal-marine, shallow-marine, and shelf deposits.
Download or read book Genetic Stratigraphic Analysis of the Upper Cretaceous Eagle Sandstone Bearpaw Mountains Area North central Montana written by Laird D. Little and published by . This book was released on 1994 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Hell Creek Beds of the Upper Cretaceous of Montana written by Barnum Brown and published by . This book was released on 1907 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Maudlow and Sedan Formations of the Upper Cretaceous Livingston Group on the West Edge of the Crazy Mountains Basin Montana written by Betty Skipp and published by . This book was released on 1977 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cenozoic Tectonic Evolution of Southwest Montana and East central Idaho written by Edward Thompson Ruppel and published by . This book was released on 1993 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Hell Creek Beds Of The Upper Cretaceous Of Montana written by Barnum Brown and published by Legare Street Press. This book was released on 2023-07-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a seminal work in paleontology, detailing the geology and fossil record of Montana's Hell Creek Formation. Renowned paleontologist Barnum Brown describes his extensive excavations and discoveries of dinosaur species such as Triceratops and Tyrannosaurus rex. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Geologic and Fission track Evidence for Late Cretaceous Faulting and Mineralization Northeastern Flank of Blacktail Mountains Southwestern Montana written by Russell G. Tysdal and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Eagle Valley Evaporite Northwest Colorado written by William Wyman Mallory and published by . This book was released on 1971 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Description, distribution, and heavy-mineral content of some Upper Cretaceous and lower Tertiary orogenic conglomerates in northern Utah.
Download or read book Cordilleran Partitioning and Foreland Basin Evolution as Recorded by the Sedimentation and Stratigraphy of the Upper Cretaceous Carten Creek and Golden Spike Formations Central western Montana written by Amy M. Waddell and published by . This book was released on 1997 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Gulf of Mexico Sedimentary Basin written by John W. Snedden and published by Cambridge University Press. This book was released on 2019-11-21 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and richly illustrated overview of the Gulf of Mexico Basin, including its reservoirs, source rocks, tectonics and evolution.
