U.S. Geological Survey
National Coal Resources Data System
U.S. Coal Resource Databases
USCOAL and NEWCOAL
| Geological age names used with USCOAL and NEWCOAL. |
|
| System | Series |
| Tertiary | Pliocene |
| Miocene | |
| Oligocene | |
| Eocene | |
| Paleocene | |
| Cretaceous | Upper |
| Lower | |
| Jurassic | Upper |
| Middle | |
| Lower | |
| Triassic | Upper |
| Middle | |
| Lower | |
| Permian | Upper |
| Lower | |
| Pennsylvanian | Upper |
| Middle | |
| Lower | |
| Mississippian | Upper |
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Last updated 01 April 2004