High-resolution stratigraphy and paleobiology of the Hartland Shale Member: analysis of an oxygen-deficient epicontinental sea ( USA).

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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 unconformably overlain by the Bridge Creek Limestone Member of the Greenhorn Limtestone. 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/stillstand model is proposed to account for these patterns of cyclic sedimentation and oxygen-deficient biofacies distribution. -Author

Original languageEnglish (US)
Pages (from-to)110-121
Number of pages12
JournalUnknown Journal
StatePublished - Jan 1 1985

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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