| Spence Shale | |
|---|---|
| Stratigraphic range: Cambrian, Miaolingian, Wuliuan ~ | |
 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 |
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]
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]
- ^ Kimmig, J., Strotz, L.C., Kimmig, S.R., Egenhoff, S.O., Lieberman, B.S. 2019. The Spence Shale Lagerstätte: an important window into Cambrian biodiversity. Journal of the Geological Society of London, 176, 609–619.
- ^ Walcott, C.D. 1908. Cambrian Geology and Palaeontology. Smithsonian Museum, Miscellaneous Collections, 53.