Grand River Formation
| Grand River Formation Stratigraphic range: Pennsylvanian | |
|---|---|
| Type | Formation |
| Underlies | Ionia Formation |
| Overlies | Saginaw Formation |
| Location | |
| Region |  |
| Country |  |
| Extent | accessdate= 22 June 2014 |
| Ph |
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| pŠ |
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