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High-Resolution Stratigraphy and Paleobiology of the Hartland Shale Member: Analysis of an Oxygen-Deficient Epicontinental Sea

By
B. B. Sageman
B. B. Sageman
Department of Geological Sciences
University of Colordo
Boulder, Colorado
80309
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Published:
January 01, 1985

Abstract

The Hartland Shale Member of the Greenhorn Limestone is predominantly composed of finely laminated calcareous shale with high levels of organic carbon and low levels of fossil diversity and abundance, suggesting a Cretaceous epicontinental anoxic event. At Rock Canyon anticline the Hartland member is conformably underlain by the Lincoln Limestone Member and conformably overlain by the Bridge Creek Limestone Member of the Greenhorn Limestone. A detailed lithostratigraphic, geochemical and paleobiologic study of this interval has identified characteristic lithofacies and biofacies which subdivide the member into three units and suggests a cyclic pattern of oceanographic processes during Hartland deposition. An alternating transgressive pulse/stil1 stand model is proposed to account for these patterns of cyclic sedimentation and oxygen-deficient biofacies distribution.

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SEPM Field Trip Guide

Fine-Grained Deposits and Biofacies of the Cretaceous Western Interior Seaway: Evidence of Cyclic Sedimentary Processes

Lisa M. Pratt
Lisa M. Pratt
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Erle G. Kauffman
Erle G. Kauffman
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Frederick B. Zelt
Frederick B. Zelt
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SEPM Society for Sedimentary Geology
Volume
4
ISBN electronic:
9781565762794
Publication date:
January 01, 1985

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