Category:Polk Creek Shale
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Media in category "Polk Creek Shale"
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NPS hot-springs-geologic-map.jpg 3,256 × 1,816; 1.79 MB
Categories:
- Geologic formations in Oklahoma
- Ordovician formations in Oklahoma
- Shale formations in Oklahoma
- Ordovician sedimentary rocks in Oklahoma
- Fossil bearing geologic formations in Oklahoma
- Geologic formations in Arkansas
- Ordovician formations in Arkansas
- Ordovician sedimentary rocks in Arkansas
- Shale formations in Arkansas
- Fossil bearing geologic formations in Arkansas
- Geology of the Ouachita Mountains
- Ordovician southern paleotropical deposits in the United States