« Previous
Next »
Region
- Powder River Basin (Wyo. and Mont.)7
- Michigan5
- Uinta Basin (Utah and Colo.)5
- Appalachian Basin4
- Ontario4
- NevadaEsmeralda County3
- Oklahoma3
- Texas3
- Utah3
- Cascade Range2
- Colorado2
- Fort Union Formation2
- Kansas2
- Middle West2
- Minnesota2
- MontanaPioneer Mountains2
- Piceance Creek Basin (Colo.)2
- Québec (Province)2
- Wisconsin2
- Wyoming2