| State | Maine |
|---|---|
| Name | Silurian unnamed conglomerate |
| Geologic age | Silurian |
| Lithologic constituents | Major
Sedimentary > Clastic > ConglomerateW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist facies; Protolith I - Conglomerate
|
| Comments | Named Smyrna Mills Formation for town of Smyrna Mills in the Smyran Mills quadrangle, ME. Consists of varying clastic rock types including slate, siltstone, quartzite, quartz graywacke and some calcareous types. Its lower contact with underlying ribbon rock member of Meduxnekeag Formation is gradational. (ME051) Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone |
| 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.Neuman, R.B., 1967, Bedrock geology of the Shin Pond and Stacyville quadrangles, Penobscot County, Maine, IN Shorter contributions to general geology, 1965: U.S. Geological Survey Professional Paper, 524-I, p. I1-I39.https://pubs.er.usgs.gov/publication/pp524I |
| NGMDB product | |
| Counties | Aroostook - Penobscot - Somerset |