Download or read book Stratigraphic Correlation of the Heterogeneous Cretaceous Aged Sediments of the Potomac Formation in New Castle County Delaware Through Examination of Core Well Logs and Palynology written by Michael Fulton and published by . This book was released on 2019 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The biostratigraphic and lithostratigraphic studies allow the distribution of sediments in the Potomac Formation to be more accurately understood. The lithologic interpretations give insight into aquifer connectivity and can be used to better understand groundwater flow. The new biostratigraphic interpretations increase the extent of subsurface correlations and validate the zone interpretations identified in previous studies.
Download or read book Internal Stratigraphic Correlation of the Subsurface Potomac Formation New Castle County Delaware and Adjacent Areas in Maryland and New Jersey written by Richard N. Benson and published by . This book was released on 2006 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a new time-stratigraphic framework for the subsurface Potomac Formation of New Castle County, Delaware, part of adjacent Cecil County, Maryland, and nearby tie-in boreholes in New Jersey. The framework is based on a geophysical well-log correlation datum that approximates the contact between Upper and Lower Cretaceous sediments. This datum is constrained by age determinations based on published and unpublished results of studies of fossil pollen and spores in samples of sediment cores from boreholes in the study area. Geophysical log correlation lines established above and below the datum approximate additional chronostratigraphic surfaces. The time-stratigraphic units thus defined are not correlated parallel to the basement unconformity, as in previous practice, but instead onlap it in an updip direction. In future studies, the sedimentary facies of the Potomac Formation within each time-stratigraphic layer may be mapped and analyzed as genetically related contemporaneous units. This new stratigraphic framework will allow better delineation of the degree of lateral connection between potential aquifer sands, thus enhancing understanding of aquifer architecture.
Download or read book Reconstructing Landscapes Across the Early to Late Cretaceous Transition Evaluating Base Level Climate and Sequence Stratigraphy from Potomac Formation Sediments in New Jersey and Delaware written by Jesse Daniel Thornburg and published by . This book was released on 2016 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mid-Cretaceous (Barremian/Aptian/Albian/Cenomanian stages) marks the transition to global greenhouse climatic conditions. The mid-Cretaceous Potomac Formation, deposited on the North American coastal plain, offers the potential to study a nonmarine fluvial/deltaic deposit that experienced changes in climate and sea level. This study involves three coreholes from New Jersey (Fort Mott and Medford) and Delaware (Summit Marina) that were used to evaluate the landscape evolution through this time interval and to develop an enhanced method of correlation between these sites. Paleosols offer excellent records of terrestrial conditions during their formation. 103 total paleosols were identified and analyzed from all three sites and grouped into five pedotypes ranging in pedogenic maturity: Gray and Gray-Red Types are weakly developed, immature soils formed under poor drainage conditions; Red and Purple Types are moderately developed soils formed under alternating wet/dry conditions; Brown Type are well-developed, mature soils formed under well drained conditions. A morphology index and two geochemical proxies (Nb and Ba/Sr) provide further information on paleoprecipitation, and drainage conditions. A conceptual model was developed linking the Nb paleoprecipitation proxy and Ba/Sr drainage proxy to determine landscape changes as a result of precipitation/evaporation versus base level. Potomac Formation Unit I displays varying dry to wet conditions up section from the unit base. The morphology index and geochemical proxies provide evidence that Unit I was sub-humid with episodes of saturation and overall drier conditions relative to overlying units. Paleoprecipitation was the main control on the formation of these paleosols. Units II (lower Albian to lower Cenomanian) and III (lower Cenomanian) have similar wet and dry conditions upsection through both units. Paleoprecipitation played a role lower in Unit II although upsection base level exerts more influence on landscape conditions. The morphology index and geochemical proxies provide evidence Units II and III were deposited under wetter conditions, experiencing sub-humid to humid conditions, with episodes of drying. Palynology also provides a correlation tool, and was analyzed here to try and establish a higher resolution of correlation. This was attempted using angiosperm diversity patterns, specifically Monocots-Magnoliids, Eudicots and the ratio of Eudicots to Monocots-Magnoliids. The inconsistent sample material as well as sparse angiosperm populations did not allow for a higher resolved correlation. A sequence stratigraphic framework was developed for the Potomac Formation. The Potomac Formation units were subdivided into packages known as Fluvial Aggradation Cycles (FACs). An analysis of FAC stacking patterns reveals potential sequence boundaries and systems tracts. FACs support the identification of unit boundaries as sequence boundaries. FACs also indicate tentative higher order sequence boundaries and provide potential additional correlative surfaces among Potomac Formation sites. This study reconstructed the landscape showing the variability in climate (precipitation/evaporation) and base-level through time that had a significant influence the formation of coastal plain paleosols. This enhances the overall understanding of how coastal plain landscapes evolve in transitions towards greenhouse climates during overall transgressions. The use of FACs has provided a potentially novel method to correlate sites at a higher resolution, creating tie points within these lithologic units. It also provided further information on the landscape evolution through this time interval, offering information on base-level and accommodation.
Download or read book First State Geology written by and published by . This book was released on 1994 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy of the Post Potomac Cretaceous Tertiary Rocks of Central Delaware written by Richard N. Benson and published by . This book was released on 1996 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Palynostratigraphy of the Late Cretaceous Coniacian Magothy Formation of Delaware and Maryland written by Robert Caleb Norville and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examines the palynostratigraphy of the Magothy Formation in the Northern Delmarva Peninsula with the objectives of correlation with the Magothy Formation of New Jersey; documentation of palynomorphs within this interval; assessment of the depositional history and environment of these sediments; and determination of whether the overlying Cheesequake Formation is present in the study area. In northern Delmarva the Magothy Formation is a Coniacian aged deposit consisting mainly of tidally influenced estuarine and fluvial sands and lignitic clays. The lateral continuity of these subsurficial Magothy sand beds remains poorly understood in their updip section around northern Delaware. An improved biostratigraphic understanding of this poorly studied interval may aid future mapping efforts. Additionally, documentation of Magothy Formation palynomorphs from the study area has been lacking. Previous work in central New Jersey has divided the Magothy Formation into three palynostratigraphic zones, but these zones have yet been systematically correlated to Delaware. This study fills that gap with a palynological analysis conducted on Magothy sediments at nine sites across northern Delaware and Maryland to gain a better understanding of the depositional history, distribution, and lateral continuity of the northern Delmarva Magothy Formation. Two continuously drilled wireline cores at Port Penn Delaware and Bohemia River State Park were drilled into the Magothy Formation for the purposes of this project, and field sampling of Magothy Formation outcrops was conducted at Grove Point Maryland and along the Chesapeake and Delaware Canal. Additionally, material from previously drilled core holes and split spoon cores at five sites were examined for palynomorphs. All sites contained Normapolles type angiosperm pollen indicative of a Magothy age (Coniacian). Assemblages from Lums Pond, Summit Marina, Middletown, Woodland Beach, Dover AFB, the Canal Outcrop, and Grove Point were consistent with the presence of the upper Magothy ?Pseudoplicapollis cuneata-Semioculopollis verrucosa (Pc-Sv) zone. The lowermost Complexiopollis exigua - Santalacites minor zone (Ce-Sm), was recognized at Bohemia River and at Dover AFB. The middle Pseudoplicapollis longiannulata- Plicapollis incisa (Pl-Pi) zone was recognized at Port Penn, lower in the Lums Pond core, and in a thin interval in the Bohemia River core. This diversity of observed assemblages across the nine sites in the study reveal a high degree of lateral variability between sites consistent with a paleochannel-fill model of deposition. A pollen assemblage suggestive of equivalence with the Cheesequake Formation was found directly above the Magothy Formation in the Bohemia River core, and assemblages from directly above the Magothy Formation at several other sites are consistent with the presence of this previously unrecognized unit in Delaware. Additionally, a large collection of palynomorph photographs was accumulated for this project to document the local palynology of the Magothy Formation; many of those are here presented in the plates to aid future workers in studying this interval.
Download or read book The Potomac Formation written by Lester Frank Ward and published by . This book was released on 1895 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Studies of Cretaceous and Tertiary Section Test Well Je32 04 Central Delaware written by Richard N. Benson and published by . This book was released on 1985 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Upper Cenozoic Sediments of the Lower Delaware Valley and the Northern Delmarva Peninsula New Jersey Pennsylvania Delaware and Maryland written by James Patrick Owens and published by . This book was released on 1979 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two periods of gravel sedimentation have been outlined--one late Miocene and the other late Pleistocene.
Download or read book Maryland Geological Survey Upper Cretaceous 2 pts written by Maryland Geological Survey and published by . This book was released on 1916 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Potomac Formation Classic Reprint written by Lester Frank Ward and published by Forgotten Books. This book was released on 2018-02-13 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Potomac Formation I therefore began my stratigraphical studies upon this theory, and have conducted them from this point of view during a period of three years. As I advanced with the work I became more and more firmly convinced of the correctness of this position, and the results at which I have been able to arrive - due in the main, as I feel sure, to the employment of a correct hypothesis - are so important that-at the risk of seeming to make unsupported assertions I have felt impelled to embody the more general of them in the present paper, in which it will he obviously impossible to give the detailed evidence which has led me to the conclusions stated. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book The Potomac Formation written by Lester Frank Ward and published by . This book was released on 1897 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentary Petrology of the Cretaceous Sediments of Northern Delaware in Relation to Paleogeographic Problems written by Ira Wendell Marine and published by . This book was released on 1953 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Middle Cretaceous Stratigraphy on the South and East Sides of the Uinta Basin Northeastern Utah and Northwestern Colorado written by C. M. Molenaar and published by . This book was released on 1991 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy of the Outcropping Post Magothy Upper Cretaceous Formations in Southern New Jersey and Northern Delmarva Peninsula Delaware and Maryland written by and published by . This book was released on 1970 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Paleoenvironments of the Cretaceous Western Interior Seaway USA written by Walter E. Dean and published by . This book was released on 1998 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the results of a coordinated, multidisciplinary study of Cretaceous carbonate and clastic rocks in cores collected along a transect across the old Cretaceous seaway that extended from the Gulf Coast to the Arctic by a team of academic, industry and US Geological Survey scientists.
Download or read book Stratigraphy Depositional Environments and Sedimentary Tectonics of the Western Margin Cretaceous Western Interior Seaway written by Dale Nations and published by Geological Society of America. This book was released on 1991 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
