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Pennsylvanian strata in southwestern Montana include the Quadrant and at least the upper beds of the Amsden Formation. Rocks of equivalent age are found throughout most of south-central Montana and extend into neighboring states to the east, south, and southwest, where they are known under various formational names. For some time it has been believed that a contribution to Pennsylvanian stratigraphy in this area could be made by study of the micro-fauna, particularly the fusulinids. For this study, sections previously measured and reported as being fairly complete and well-exposed were revisited for detailed examination. The sections examined were chosen with the idea in mind of obtaining a series of sections which would show the maximum variation in facies and thickness in relation to the presumed positions of the ancient Pennsylvanian shorelines. All types of sediments were examined for fusulinids, particular attention being paid to the shales, carbonates, and cherts. Nine sections of Pennsylvanian strata were examined and measured in detail. In addition, four other sections were examined for fusulinid remains. Fusulinids were found to occur in only three sections. Fortunately, these sections are situated in critical areas, thereby establishing important relationships. New information has been found concerning the correlation and geologic age of the Pennsylvanian strata. These data, as well as other pertinent information pertaining to the Pennsylvanian sediments, are discussed in the body of the text and summarized in the conclusions.
Includes Part 1A: Books and Part 1B: Pamphlets, Serials and Contributions to Periodicals