The Langston Formation is a geologic formation in Idaho and Utah . It preserves fossils dating back to the Cambrian period . The formation is composed of bluish-gray limestone, weathering to a buff color, often with rounded edges.
2-531: Blacksmith Fork is the type locality, and includes more fossils than the Idaho sections. The Langston Formation includes the fossilerous Spence Shale . This article about a specific stratigraphic formation in Idaho is a stub . You can help Misplaced Pages by expanding it . This article related to the Cambrian period is a stub . You can help Misplaced Pages by expanding it . Spence Shale The Spence Shale
4-713: Is the middle member of the Langston Formation in southeastern Idaho and northeastern Utah . It is exposed in the Bear River Range , the Wasatch Range and the Wellsville Mountains . It is known for its abundant Cambrian trilobites and the preservation of Burgess Shale -type fossils. The type locality is Spence Gulch in southeastern Idaho , near the town of Liberty. It was first described by Charles Doolittle Walcott in 1908. The Spence Shale spans
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