Explore Search: Shale
map
![Collage of USGS Maps.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/search_result/public/media/images/newsletter-search-default-thumbnails-real-time-maps_0.png?h=6bc574fb&itok=HLLitYZf)
Geologic and biostratigraphic map of the Pierre shale between Jarre Creek and Loveland, Colorado
publication
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Zircon from a bentonite bed in Martinsburg shale (Ordovician) at Fisher's Hill, Virginia
publication
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