Detailed descriptions of completely exposed sections of Sappington sandstone have not been published. The purpose of this note is to describe in detail two remarkably complete sections of the Sappington which are located in Jefferson and Madison counties, in southwestern Montana (Fig. 1). These sections were discovered while the writers were instructing at the Indiana University Geologic Field Station near Cardwell, Montana, where the Sappington is found between the Upper Devonian Threeforks shale and the overlying Lower Mississippian Lodgepole limestone. The name Sappington sandstone is misleading because the upper part of the formation consists of silt-sized clastic material...

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