Barite from the Cedar Creek Anticline, Glendive, Montana.

Pierre Shale outcrops in South Dakota--particularly the [Elk Creek location (Roberts and Campbell 1987)--have produced superb barite crystals in the past but are now generally closed to collecting. Two lesser-known accessible Montana localities have for years generated similar specimens from a higher member of the same formation but are undocumented. This article details the easternmost occurrence, numerous parcels of BLM-administered land in what is known as the Pine Oil Field, 14 miles south of Glendive, Montana (fig. 1).

[FIGURE 1 OMITTED]

Geology

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