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Region
- Georgia18
- MassachusettsStellwagen Bank National Marine Sanctuary17
- Stellwagen Bank National Marine Sanctuary (Mass.)17
- Appalachian Basin7
- Long Island Sound (N.Y. and Conn.)7
- Stellwagen Bank6
- United States6
- Uinta Basin (Utah and Colo.)5
- Massachusetts Bay (Mass.)4
- MassachusettsMassachusetts Bay4
- Syria3
- Utah3
- ColoradoJackson County2
- ColoradoRoutt County2
- Fort Union Formation2
- Gwinnett County (Ga.)2
- Lebanon2
- Montana2
- New Jersey2
- Piceance Creek Basin (Colo.)2