Region
- India4
- Iraq4
- Missouri4
- Pavonis Mons Region (Mars)4
- Wyoming4
- ArizonaPima County3
- Atlanta (Ga.)3
- Caribbean Area3
- Congo (Brazzaville)3
- Costa Rica3
- Cuba3
- France3
- GeorgiaAtlanta3
- Green River Formation3
- Madras (India)3
- Massachusetts3
- Powder River Basin (Wyo. and Mont.)3
- America2
- ArkansasHarrison Region2
- Atlantic Coast (U.S.)2