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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The Jefferson and Three Forks Formations, mostly of Late Devonian age, are recognized in western Wyoming and adjacent areas far south of the classic localities of southwestern Montana. The Jefferson is divided into an unnamed lower member and a prominent ledge-forming dolomite called the Birdbear Member. Intraformational correlation of laterally persistent carbonate ledges and detrital interbeds in closely spaced measured sections demonstrates that the Darby Formation of west-central Wyoming is equivalent to the lower member of the Jefferson Formation. The Logan Gulch and Trident Members of the Three Forks are equivalent to the sandy Beirdneau Formation in the miogeosyncline of southeastern Idaho and northeastern Utah. Members of the Jefferson and Three Forks are truncate eastward in Wyoming and are overlain by a dark shale unit of Devonian and Mississippian age.
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