Au Train Formation
| Au Train Formation Stratigraphic range: Early Ordovician |
|
|---|---|
| Type | Formation |
| Underlies | Black River Formation |
| Overlies | Munising Formation |
| Location | |
| Region |
 Michigan
|
| Country |
 United States
|
The Au Train Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.
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Wikipedia