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Articles 1 - 13 of 13
Full-Text Articles in Entire DC Network
Climate And Atlantic Sea-Level Recorded In Southwestern Spain From 6.3 To 5.2 Ma. Inferences On The Messinian Crisis In The Mediterranean, Jean Pierre Suc, Séverine Fauquette, Sophie Warny, Gonzalo Jiménez-Moreno, Damien Do Couto
Climate And Atlantic Sea-Level Recorded In Southwestern Spain From 6.3 To 5.2 Ma. Inferences On The Messinian Crisis In The Mediterranean, Jean Pierre Suc, Séverine Fauquette, Sophie Warny, Gonzalo Jiménez-Moreno, Damien Do Couto
Faculty Publications
The Mio-Pliocene succession of Andalusia on the Atlantic coast (Guadalquivir Basin) is known as one of the former stratotype candidate for the Andalusian Stage, proposed during the seventies as the last stage of the Miocene. Its type section is located in Carmona, east of Seville. Our investigation includes the drilling of three cored boreholes, which provide bio- and magnetic-stratigraphic data in complement to pre-existing industrial information, and a high-resolution palynological analysis (pollen grains, spores and dinoflagellate cysts). The pollen flora and its climatic quantification provide the mean to correlate the section to the oxygen isotope curve from the Montemayor-1 borehole, …
Major Lower Paleozoic Horizons Of The Southern Illinois Basin, John B. Hickman
Major Lower Paleozoic Horizons Of The Southern Illinois Basin, John B. Hickman
Report of Investigations--KGS
The geology exposed at the surface in the southern Illinois Basin has been mapped in great detail by countless workers over the past century. With the exception of limited and scattered exposures in incised river valleys, the oldest rocks exposed outside of the Jessamine, Nashville, and Ozark Domes surrounding the Illinois Basin are Mississippian in age. Extensive deposits of Cambrian–Devonian sediments occur in the subsurface above crystalline basement in this region, however. All available data for the region were analyzed to produce a single, comprehensive set of interpretations. The data used in this study include 1:24,000-scale geologic quadrangle maps, oil …
U–Pb-Dated Flowstones Restrict South African Early Hominin Record To Dry Climate Phases, Robyn Pickering, Andy I.R. Herries, Jon D. Woodhead
U–Pb-Dated Flowstones Restrict South African Early Hominin Record To Dry Climate Phases, Robyn Pickering, Andy I.R. Herries, Jon D. Woodhead
KIP Articles
The Cradle of Humankind (Cradle) in South Africa preserves a rich collection of fossil hominins representing Australopithecus, Paranthropus and Homo1. The ages of these fossils are contentious2,3,4 and have compromised the degree to which the South African hominin record can be used to test hypotheses of human evolution. However, uranium–lead (U–Pb) analyses of horizontally bedded layers of calcium carbonate (flowstone) provide a potential opportunity to obtain a robust chronology5. Flowstones are ubiquitous cave features and provide a palaeoclimatic context, because they grow only during phases of increased effective precipitation6,7, ideally in closed caves. Here we show that flowstones from eight …
Pleistocene Deposits In The Southern Egyptian Sahara: Lithostratigraphic Relationships Of Sediments And Landscape Dynamics At Bir Tarfawi, Christopher L. Hill, Romuald Schild
Pleistocene Deposits In The Southern Egyptian Sahara: Lithostratigraphic Relationships Of Sediments And Landscape Dynamics At Bir Tarfawi, Christopher L. Hill, Romuald Schild
Anthropology Faculty Publications and Presentations
The sedimentological and lithostratigraphic record from north-central Bir Tarfawi documents the presence of Pleistocene basin-fill deposits. Three topographic basins were created as a result of deflation during climate episodes associated with lowering of the local groundwater table. In each case, the three deflational basins or topographic depressions were subsequently filled with sediments; these basin aggradations coincided with changes from arid climate conditions to wetter conditions and a rise in the groundwater table. The oldest and highest sedimentary remnant is associated with Acheulian artifacts and may reflect spring-fed pond and marsh conditions during a Middle Pleistocene wet climate episode. Lithofacies for …
Geological Controls On Stratigraphy And Sedimentation Of The Mississippian Marshall Formation, Michigan Basin, U.S.A., Joseph G. Adducci
Geological Controls On Stratigraphy And Sedimentation Of The Mississippian Marshall Formation, Michigan Basin, U.S.A., Joseph G. Adducci
Masters Theses
An understanding of regional orogenic, climatic, and eustatic processes is critical to the interbasinal correlation of Paleozoic strata in eastern North America. Tectonic activity associated with the culmination of Appalachian Orogenic events has been shown to have regional influence on paleostructure and sediment dispersal in the Appalachian foreland basin and adjacent intracratonic Illinois and Michigan basins. The culmination of the Acadian Orogeny at the end of the Devonian represents the beginning of a period of general tectonic quiescence extending throughout the early and middle Mississippian in eastern North America. Early Mississippian strata in the Michigan basin is distinctive and marks …
The Geologic Implications Of The Factors That Affected Relative Sea-Level Positions In South Carolina During The Pleistocene And The Associated Preserved High-Stand Deposits, William Richardson Doar Iii
The Geologic Implications Of The Factors That Affected Relative Sea-Level Positions In South Carolina During The Pleistocene And The Associated Preserved High-Stand Deposits, William Richardson Doar Iii
Theses and Dissertations
This work utilizes the current understanding of South Carolina geology to provide a stratigraphic review of the late-Pliocene and Pleistocene marine deposits. Almost two centuries of recorded geological study includes geomorphic and stratigraphic units that were described, proposed, revised, abandoned, and revived. Along with the history of the age assignments, changes in geological time scales, and the changes in the understanding of geological concepts, this review is necessary because two concurrent and conflicting stratigraphies exist for late-Pliocene and Pleistocene marine sediments that record multiple sea-level transgressions that were more often destructive than constructive. The result, when tested against existing geological …
Sedimentological And Stratigraphic Study Of A Falling-Stage Delta Complex In The Upper Cretaceous (Turonian) Ferron Sandstone Member Of The Mancos Shale, South-Central Utah, Usa, Fares Alaboud
Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research
The character and distribution of lithofacies in falling-stage deltas are incompletely documented. This paper presents a sedimentological and stratigraphic evaluation of a superbly-exposed interval of Cretaceous deltaic strata that are believed to be of falling stage origin. The studied interval forms part of the Upper Cretaceous (Turonian) Ferron Sandstone Member of the Mancos Shale in the southernmost Henry Mountains Basin of south-central Utah, USA. The interval of interest is exposed in three dimensions over a 20 km2 area in a series of canyon walls. Observed facies include fine-grained mudrocks (offshore basin), mudrocks with thinly interlaminated sandstone (prodelta), thinly interbedded …
Holocene Earthquakes And Late Pleistocene Slip-Rate Estimates On The Wassuk Range Fault Zone, Nevada, J. M. Bormann, Benjamin E. Surpless, M. W. Caffee, S. G. Wesnousky
Holocene Earthquakes And Late Pleistocene Slip-Rate Estimates On The Wassuk Range Fault Zone, Nevada, J. M. Bormann, Benjamin E. Surpless, M. W. Caffee, S. G. Wesnousky
Earth and Environmental Geosciences Faculty Research
The Wassuk Range fault zone is an 80‐km‐long, east‐dipping, high‐angle normal fault that flanks the eastern margin of the Wassuk Range in central Nevada. Observations from two alluvial fan systems truncated by the fault yield information on the vertical slip rate and Holocene earthquake history along the range front. At the apex of the Rose Creek alluvial fan, radiocarbon dating of offset stratigraphy exposed in two fault trenches shows that multiple earthquakes resulted in 7.0 m of vertical offset along the fault since ∼9400 cal B.P. These data yield a Holocene vertical slip rate of 0.7±0.1 mm/yr. The south trench …
A Study On The Geology Of The Ţaga Region (Cluj District), Ioan MâRza
A Study On The Geology Of The Ţaga Region (Cluj District), Ioan MâRza
Studia UBB Geologia
The geological formations from Ţaga area (Cluj District) are Sarmatian in age (in outcrops) and Badenian (under surface). Lithologically, they are represented mainly by sands and sometimes fine sediments (clays, marls), interbedded with volcanic tuffs a low fossil content. The Badenian is the host of gas accumulations, concentrated in dome structures.
The Biscayne Aquifer Of Southeastern Florida, Kevin J. Cunningham, Lee J. Florea
The Biscayne Aquifer Of Southeastern Florida, Kevin J. Cunningham, Lee J. Florea
Earth, Environmental, and Atmospheric Sciences Faculty Publications
No abstract provided.
Stratigraphy And Depositional Environments Of Lower And Middle Cambrian Strata In The Lake Mead Region, Southern Nevada And Northwestern Arizona, Joseph Kirk Hardy
Stratigraphy And Depositional Environments Of Lower And Middle Cambrian Strata In The Lake Mead Region, Southern Nevada And Northwestern Arizona, Joseph Kirk Hardy
UNLV Retrospective Theses & Dissertations
The stratigraphy and depositional systems revealed within the Lower to Middle Cambrian Tapeats Sandstone-Pioche Shale-Lyndon Limestone-Chisholm Shale succession were studied between the easternmost limit of Cretaceous overthrusting in southern Nevada and the western edge of the Colorado Plateau in northwestern Arizona. Nine intergradational lithofacies were distinguished based on a rich suite of sedimentary structures, including lenticular-, wavy-, and flaser-bedding, wrinkle marks, herringbone cross-stratification, convolute bedding, primary current lineations, interference ripple marks, bird's eye structures, thrombolites, intraformational conglomerates, oncoids, cryptalgal laminites, and Arenicoloides, Corophioides, and Skolithos ichnofossils. The collective presence of these structures indicates that Lower and Middle Cambrian rocks in …
The Stratigraphic Relationships Of The Columbia River Basalt Group In The Lower Columbia River Gorge Of Oregon And Washington, Terry Leo Tolan
The Stratigraphic Relationships Of The Columbia River Basalt Group In The Lower Columbia River Gorge Of Oregon And Washington, Terry Leo Tolan
Dissertations and Theses
The purpose of this study was to produce a detailed geologic map of the CRBG in the western portion of the Columbia River Gorge (fig. 1). The objectives were (1) to identify and delineate the extent of the Priest Rapids Member and Pomona Member intracanyon flows, and (2) to define the relationship of post-CRBG units to the CRBG intracanyon flows.
Pleistocene Formations In Indiana, William J. Wayne
Pleistocene Formations In Indiana, William J. Wayne
Department of Earth and Atmospheric Sciences: Faculty Publications
The system of stratigraphic classification used in North America for all sedimentary rock units except nonmarine deposits of the Pleistocene Series established groups, formations, and smaller units based on objectively determined characteristics of the rocks and not on geomorphology or subjective features, such as geologic time. Not all students of the nonmarine Pleistocene have kept these two kinds of units distinct from each other. The Pleistocene sediments of Indiana and the surrounding States are continental in origin rather than marine, and thus they show far less lithologic homogeneity than sediments and rocks of marine origin. Nevertheless, these Pleistocene sediments can …