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Showing 1 to 8 of 8 for “"disconformity"”.
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Geology of the Spruce Run Mountain area, Giles County, Virginia
… of approximately 6,500 feet. An important disconformity separates rocks of Lower Ordovician age from those of Middle Ordovician age. The Saltville thrust, a southeast dipping thrust fault, crosses the Spruce Run Mountain area trending northeast. The thrust separates Middle Cambrian dolomite …
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THE CONSTRUCTION OF A LOGICAL-EMPIRICAL STRUCTURE OF KNOWLEDGE FOR DIFFERENTIAL CALCULUS USING A THEORETICAL FRAMEWORK BASED UPON LEARNING HIERARCHY THEORY AND ORDER THEORY
… ratios set at .6000. Unhypothesized relations of disconformity less than or equal to .10 were investigated. Logical reanalysis was used to resolve the pinpointed empirical difficulties. In order to resolve difficulties which were encountered in the analysis of calculus word problems, a theory or …
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High-Resolution Sequence Stratigraphy of Late Mississippian (Chesterian) Mixed Carbonates and Siliciclastics, Illinois Basin
Eight 4th-order (~400 k.y.) disconformity-bounded mixed carbonate-siliciclastic sequences were deposited in the tectonically-active, tide-dominated Illinois basin during the Late Mississippian greenhouse to icehouse transition. Detailed, lithologic cross-sections were constructed through the …
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Tertiary dinoflagellate, acritarch, and chlorophyte assemblages from the Oak Grove Core, Virginia Coastal Plain
… minor disconformities, in addition to the major disconformity at the Nanjemoy-Calvert boundary; the Calvert-Choptank contact appears conformable. The ten provisional dinoflagellate zones proposed for the Aquia, Marlboro Clay, and Nanjemoy strata of the core permit correlation with other …
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Sequence Development on a Sediment-Starved, Low Accommodation Epeiric Carbonate Ramp: Silurian Wabash Platform, USA Mid-continent During Icehouse to Greenhouse Transition
… to global cycles. Except for the lower three disconformity-bounded sequences, most sequences are relatively conformable and lack well defined sequence boundaries or subaerial exposure surfaces. The most easily mapped surfaces are the transgressive surfaces, given that the correlative …
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Supercontinents and glaciation: a perspective from western Gondwana.
… observations and results imply a significant disconformity beneath the Naauwpoort Volcanics and suggest multi-phase rifting during the breakup of south-western Congo Craton from Rodinia. The northern Paraguay Belt in South America developed in response to the collision between the Amazonian …
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Mesoproterozoic tectonic evolution of southwestern North America : protracted intracratonic deformation, sedimentation, and differential exhumation in Grand Canyon and the Rocky Mountain Region
… contraction at about 1250 Ma. A large disconformity (~75 m.y. duration) is inferred between lower and upper Unkar Group and is located below the upper Hakatai Shale as documented by detrital zircons. A second style of Unkar Group deformation involved the development of half grabens and …
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High resolution sequence stratigraphy of late Mississippian carbonates in the Appalachian Basin
The late Mississippian carbonates in the Appalachian Basin, U.S.A., were deposited on a huge, south-facing ramp during long-term Mississippian transgression that formed the Mississippian supersequence. The St. Louis- to Glen Dean interval consists of up to twelve fourth-order depositional sequences …