| State | Maine |
|---|---|
| Name | Ordovician Madawaska Lake Formation |
| Geologic age | Ordovician |
| Lithologic constituents | Major
Sedimentary > Clastic > Mudstone (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > Sandstone (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
|
| Comments | W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith C - Sulfidic/carbonaceous pelite |
| References | Osberg, P.H., Hussey, A.M., and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Dept. of Conserv., scale 1:500,000.Roy, D.C., and Mencher, E., 1976, Ordovician and Silurian stratigraphy of northeastern Aroostook County, Maine: Geol. Soc. Amer., Memoir 148, p. 25-52. |
| NGMDB product | |
| Counties | Aroostook |