Pottsville Formation
The Pottsville Formation is a large bedrock unit covering parts of Pennsylvania, Maryland, West Virginia, Ohio, and Alabama.
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The formation dates to the early to middle Pennsylvanian period.
The Broad Top basin in Pennsylvania produces fossils of marine invertebrates and plant fossils from the middle Morrowan age – which is likely what brings you to this page.
The most well known fossils for collectors will likely be the Alethopteris ferns from the site, which are a mineralised white colour against a black shale matrix, creating contrasting fossils popular amongst collectors.
Further reading
- https://www.usgs.gov/publications/origin-minerals-joint-and-cleat-systems-pottsville-formation-black-warrior-basin
- https://en.wikipedia.org/wiki/Pottsville_Formation
- https://www.sciencedirect.com/science/article/abs/pii/S0034666713001127
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