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Region
- Georgia22
- MassachusettsStellwagen Bank National Marine Sanctuary17
- Stellwagen Bank National Marine Sanctuary (Mass.)17
- United States10
- Appalachian Basin7
- Long Island Sound (N.Y. and Conn.)7
- Stellwagen Bank6
- Uinta Basin (Utah and Colo.)5
- India4
- India, South4
- Massachusetts Bay (Mass.)4
- MassachusettsMassachusetts Bay4
- Sikkim (India)3
- South Carolina3
- Syria3
- Utah3
- ColoradoJackson County2
- ColoradoRoutt County2
- Europe2
- Fort Union Formation2