LocNo: 934Cerro Gordo Fm.
| Country: |
USA
|
| Province: |
Iowa (undifferentiated)
|
| Locality: |
Bird Hill near Rockford
|
| Layer: | Cerro Gordo Fm. |
| Lower Boundary: |
Givetian--Frasnian [GIV--FRS], 385.3 million years
|
| Upper Boundary: |
UD2A--UD2B:(verneuili Zone base) [07,75], 374 million years
|
| Georeference: |