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Sublette BOCES is offering a free geology field trip on Saturday, September 9th. Instructor Ron Worl will guide a field trip between Elkhart Park and Pinedale to discuss the formation of the Wind River Range and view the many glacial landforms along the way. Ron was the head geologist for the USGS mapping of the Wind River Range.

Fremont Lake straddles two major geologic terrains, the Precambrian crystalline rocks that make up the Wind River Range and the Paleozoic to Mesozoic sedimentary rocks that underlie the Green River Basin. The contact between the Precambrian crystalline rocks and the Paleozoic to Mesozoic sedimentary rocks is a major thrust fault dipping to the northeast that carried the crystalline rocks over the sedimentary rocks. Fremont is a glacial lake that formed during the Pinedale stage of mountain glaciation. All of the landforms that surround the lake and that extend into the basin for a considerable distance were formed during this glacial period.

Registration not necessary. Meet at Elkhart Park parking lot at 9 a.m.