Au Train Formation | |
---|---|
Stratigraphic range: Early Ordovician | |
![]() Au Train Formation at
Munising Falls (
Pictured Rocks National Lakeshore) | |
Type | Formation |
Underlies | Black River Formation |
Overlies | Munising Formation |
Location | |
Region | ![]() |
Country | ![]() |
The Au Train Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period.