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Pioche Shale
Stratigraphic range: Lower Cambrian–Middle Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Olenellus fowleri from the Pioche Shale
Unit of	Pioche Formation
Location
Country	United States
Type section
Named by	Charles Doolittle Walcott, 1908

The Pioche Shale is an Early to Middle Cambrian Burgess shale-type Lagerstätte in Nevada. It spans the Early–Middle Cambrian boundary; fossils from the Early Cambrian are preserved in botryoidal hematite, whereas those from the Middle Cambrian are preserved in the more familiar carbon films, and very reminiscent of the Chengjiang County preservation.

It preserves arthropods and worms familiar from the Burgess Shalel and the kerygmachelid Mobulavermis was described from fossils found in the Pioche Shale in December 2023.

It spans the early Cambrian Olenellus and basal Middle Cambrian Eokochaspis nodosa trilobite zones.

The eastern version of this shale can be found eastwards in Grand Canyon, as the Bright Angel Shale.

References

1. ^ Moore, R. A.; Lieberman, B. S. (2009). "Preservation of Early and Middle Cambrian soft-bodied arthropods from the Pioche Shale, Nevada, USA". Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (1–2): 57–62. Bibcode:2009PPP...277...57M. doi:10.1016/j.palaeo.2009.02.014.
2. ^ Lieberman, B. S. (2003). "A New Soft-Bodied Fauna: the Pioche Formation of Nevada". Journal of Paleontology. 77 (4): 674–690. doi:10.1666/0022-3360(2003)077<0674:ANSFTP>2.0.CO;2. ISSN 0022-3360.
3. McCall, Christian (13 December 2023). "A large pelagic lobopodian from the Cambrian Pioche Shale of Nevada". Journal of Paleontology. doi:10.1017/jpa.2023.63. Retrieved 13 December 2023.
4. Geology graphic of Pioche Shale & Bright Angel Shale at 3dpards.wr.usgs.gov

External links

• Graphic of geology of area west-to-east for Lake Mead National Recreation Area (Nevada) & Grand Canyon (Arizona)

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• Cambrian Nevada
• Lagerstätten
• Shale formations of the United States
• Cambrian System of North America
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