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Recognition of Regional (Eustatic?) and Local (Tectonic?) Relative Sea-Level Events in Outcrop and Gamma-Ray Logs, Ordovician, West Virginia

By
Richard J. Diecchio
Richard J. Diecchio
Department of Geography and Earth Systems Science, George Mason University, Fairfax, Virginia 22030-4444
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Brett T. Brodersen
Brett T. Brodersen
Department of Geography and Earth Systems Science, George Mason University, Fairfax, Virginia 22030-4444
1
Current address: Department of Geology, Portland State University, Portland, OR 97207
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Published:
January 01, 1994

Abstract

Plots of the cumulative aggradation of cyclically repetitive strata were generated by a method similar to that for Fischer plots. Plots were generated for three outcrop sections of the upper part of the Upper Ordovician Juniata Formation, eleven wells penetrating the Juniata Formation, and four wells penetrating the entire Ordovician System. The resultant plots are inferred to represent relative changes in sea level for each locality over the time interval represented.

Cycles of relative sea-level change with a periodicity of approximately 5 my are apparent throughout the Ordovician. These cycles are superimposed upon a larger scale relative sea-level curve that reflects the sea-level pattern associated with the Creek holostrome (Tippecanoe I sequence). Each of these sea-level cycles can be correlated from well to well and, because of their regional extent, are possibly the effect of an eustatic cause.

Other relative shallowing and deepening events are apparent in some of the wells, and at various stratigraphic positions. These local events are interpreted as tectonic uplifts and downwarps. Many of these localized sea-level events are more long-lived than the regional 5-my sea-level signal, but have a shorter duration than the Creek holostrome.

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Contents

SEPM Concepts in Sedimentology and Paleontology

Tectonic and Eustatic Controls on Sedimentary Cycles

John M. Dennison
John M. Dennison
University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Frank R. Ettensohn
Frank R. Ettensohn
University of Kentucky, Lexington, Kentucky
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SEPM Society for Sedimentary Geology
Volume
4
ISBN electronic:
9781565762275
Publication date:
January 01, 1994

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