LocNo: 1202Onondaga M. of Romney Fm.
| Country: |
USA
|
| Province: |
Maryland
|
| Locality: |
Twenty-First-Bridge
|
| Layer: | Onondaga M. of Romney Fm. |
| Lower Boundary: |
Emsian--Eifelian [dm96:00,00] [EMS--EIF], 397.5 million years
|
| Upper Boundary: |
mid.--up.varcus Zone [17,00], 389 million years
|
| Georeference: |