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
If you are interested in other classic American locales we may have stock from the following locales.
American locales
Arizona
- Morenci Mine, Morenci, Greenlee County, Arizona, USA
- Ray Mine, Scott Mountain, Pinal County, Arizona, USA
- Southwest Mine, Hendricks Gulch, Bisbee, Cochise County, Arizona, USA
- Total Wreck Mine, Cienega Creek, The Narrows, Empire Mining District, Empire Mountains, Pima County, Arizona, USA
- Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
- Monterey formation, San Luis Obispo County, California, USA
- New Melones Dam, West Belt, Calaveras County, California, USA
- Salton Sea, Imperial County, California, USA
- Green River Formation (spanning areas of Colorado, Utah, and Wyoming.)
- Lake George, Park County, Colorado, USA
- Stoneham, Weld County, Colorado, USA
- Joplin Field, Jasper County, Missouri, USA
- Sweetwater Mine, Ellington, Reynolds County, Missouri, USA
- Franklin Mine, Franklin, Sussex County, New Jersey, USA
- Lime Crest Quarry, Sparta Township, Sussex County, New Jersey, USA
- Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
- Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
- Upper New Street Quarry, Paterson, Passaic County, New Jersey, USA
- Copper Flat, Hillsboro Mining District, Sierra County, New Mexico, USA
- Kelly Mine, Magdelena, New Mexico, USA
- Obsidian Ridge, Sandoval County, New Mexico, USA
- Anacondas Yerington open pit, Yerington, Yerington Mining District, Singatse Range, Lyon County, Nevada, USA
- Driscoll Mine, Battle Mountain Mining District, Lander County, Nevada, USA
- Hat lease, Goldfield Mining District, Esmeralda County, Nevada, USA
- Krum Hills, Humboldt County, Nevada, USA
- Liberty Mine, Reveille Mining District, Reveille Range, Nye County, Nevada, USA
- Majuba Hill Mine, Antelope Mining District, Pershing County, Nevada, USA
- Virgin Valley, Humboldt County, Nevada, USA
- Cedar Hill Quarry, Lancaster County, Pennsylvania, USA
- Dyer Quarry, Gibraltar, Birdsboro, Berks County, Pennsylvania, USA
- Pottsville Formation, St. Clair, Schuylkill County, Pennsylvania, USA
- Iron Mountain, Pinto Iron Mining District, Iron Springs Mining District, Iron County, Utah, USA
- Mammoth Mine, Mammoth, Tintic Mining District, East Tintic Mountains, Utah, USA
- Topaz Mountain, Thomas Range, Juab County, Utah, USA
For the rest of our American stock, see below.