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Lake DeSmet is a very interesting place about 3.7 mi long. It was formed in a slump caused by prehistoric underground coal fires in seams 100-200' thick, which also cooked many of the sedimentary rocks into volcanic-looking red and black clinkers.

C3_RedRockDownLake.jpg (289 Kb) (under photos/23/0910-15_Montana/0911_DeSmetAndForsyth/)

By Alan Silverstein, ajs@frii.com (page updated Tue Mar 10 18:16:39 MDT 2026)