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In this paper are presented the detailed stratigraphy of the marine Bearpaw shale, 690 feet thick, and the underlying continental Pale beds and the Foremost formation, which have a combined thickness of 1,225 feet. From surface information and well samples these formations are subdivided into several zones which permit detailed correlations.
These sediments record that the western shore line of the Montana sea receded before the advance of the continental deposits which compose the Pale beds and the Foremost. A subsequent westward marine transgression, probably the result of crustal warping, is recorded by the Bearpaw shale.
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