--> Abstract: An Overview of the Precambrian of Ohio and its Effects on Paleozoic Strata, #90907 (2000)

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ABSTRACT: An Overview of the Precambrian of Ohio and its Effects on Paleozoic Strata

WICKSTROM, LAWRENCE H., and BARANOSKI, MARK T., Ohio Department of Natural Resources, Division of Geological Survey, Columbus, OH

Until the mid-1980s, the Precambrian provinces underlying Ohio were poorly understood because of a paucity of deep subsurface data. Recently acquired continuous deep cores, together with deep stratigraphic test data, seismic reflection data, and potential-fields data, have provided many more pieces to this deeply buried puzzle. Using these new data, an updated contour map of the Precambrian surface of Ohio has been created. This new map and associated public and proprietary data allow us to test some old theories and envision new interpretations of the Precambrian geologic history of the region. New interpretations of these data indicate that a complex Precambrian structural history set the stage for the evolution and development of regional and local Paleozoic structures (including basin architecture, small- and large-scale faults and folds), and stratigraphic changes. Many Paleozoic structures and significant stratigraphic variations observed from subsurface mapping were controlled, in part, by a deeply eroded Precambrian surface and recurrent movement on pre-existing faults and province/terrane boundaries. Movement along these Precambrian zones of weakness occurred in response to stress associated with failed rifting during the early Paleozoic Era and later orogenic events. It has become increasingly apparent as deep data are analyzed that the development of a Paleozoic platform and surrounding basins in Ohio is largely the result of underpinning Precambrian features.

 

Search and Discovery Article #90907©2000 AAPG Eastern Section Meeting, London, Ontario, Canada