The Spence Shale is the middle member of the Langston Formation in southeastern Idaho and northeastern Utah.

It is known for its abundant Cambrian trilobites and the preservation of Burgess Shale-type fossils.

[1] The type locality is Spence Gulch in southeastern Idaho, near the town of Liberty.

[2] The Spence Shale spans the Albertella and Glossopleura biozones.

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