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Region
- Georgia6
- United States5
- Alaska3
- Colorado2
- Colorado River (Colo.-Mexico)2
- ColoradoEagle County2
- Grand Canyon (Ariz.)2
- Morrison Formation2
- Wanakah Formation2
- Accomack County (Va.)1
- Alabama1
- AlaskaLisburne, Cape1
- Chesapeake Bay (Md. and Va.)1
- Colorado River Valley (Colo.-Mexico)1
- Cuba1
- Egypt1
- Florida1
- Idaho1
- Johnstown Region (Pa.)1
- Kilauea Volcano (Hawaii)1