File:Seal source Mansfield.png
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Categories:
- Stratigraphic columns of the United States
- Mansfield, Ohio
- Stratigraphic columns of Ohio
- Petroleum in the United States
- Appalachian Basin
- Mansfield Natural Gas Field
- Beekmantown Group
- Knox Group (geology)
- Marcellus Shale - stratigraphy
- Utica Formation - stratigraphic columns
- Berea Sandstone - stratigraphy
- Oriskany Group
- Hydrocarbons