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Par Collection Par Auteur- ASHWORTH, A. C. (1)
- 1980 (1)
- Environmental implications of a beetle assemblage from the Gervais Formation (Early Wisconsinan?), Minnesota
- The Gervais Formation of northwestern Minnesota is the oldest known Quaternary stratigraphic unit in the Red River Valley. Wood from the fossiliferous silt and peat member is >46,900 yr old. The age of the unit is uncertain but may be early
- 1980