Spence Shale

The Spence Shale 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.^[1]

TypeMember

Thickness9–120 m (30–394 ft)

Primarycarbonate mudstones

Othercarbonate-rich siliciclastic mudstones and Wackestones

Quick facts Type, Thickness ...

Spence Shale
Stratigraphic range: Cambrian, Miaolingian, Wuliuan ~507.5–506 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Hyolitha, Spence Shale
Type	Member
Thickness	9–120 m (30–394 ft)
Lithology
Primary	carbonate mudstones
Other	carbonate-rich siliciclastic mudstones and Wackestones
Location
Region	Idaho, Utah
Country	United States
Type section
Named for	Spence Gulch
Named by	Charles Doolittle Walcott

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The type locality is Spence Gulch in southeastern Idaho, near the town of Liberty. It was first described by Charles Doolittle Walcott in 1908.^[2]