Galena Group
Sedimentary sequence of Ordovician limestone
From Wikipedia, the free encyclopedia
The Galena Group or Galena Limestone refers to a sedimentary sequence of Ordovician limestone that was deposited atop the Decorah Shale. It is part of the Ordovician stratigraphy of the Upper Midwestern United States. It was deposited in a calm marine environment, and is fossiliferous.[2]
| Galena Group | |
|---|---|
| Stratigraphic range: Darriwilian-Sandbian | |
Unidentified Trochonema from the Galena Group | |
| Type | Group |
| Sub-units | Decorah Shale, Dunleith Formation, Wise Lake Formation, Dubuque Formation[1] |
| Underlies | Maquoketa Group |
| Overlies | Platteville Limestone |
| Location | |
| Country | United States |
| Extent | Minnesota, Wisconsin and Illinois |
