| State | Maine |
|---|---|
| Name | Silurian - Ordovician Mars Hill Conglomerate |
| Geologic age | Silurian - Ordovician |
| Lithologic constituents | Major
Sedimentary > Clastic > ConglomerateW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith I - Conglomerate
|
| Comments | Named as a formation in Meduxneag Group (rank raised). Named for community of Carys Mills, Aroostook Co., northeast ME. Formerly called ribbon rock member of Meduxnekeag Formation. Consists of gray-blue limestone and calcareous siltstone interbedded with buff-weathered ankeritic limestone and with gray and green slate. Slate and slate with graywacke lenses present at different stratigraphic levels in Bridgewater quad. Thickness about 12,000 ft in Bridgewater quad. Conformably underlies and grades into Smyrna Mills Formation. (ME052) Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith A - 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.Neuman, R.B., pers. communication, 1983.Genes, A.N., Newman, W.A. and Brewer, T.B., 1981, Late Wisconsinan glaciation models of northern Maine and adjacent Canada: Quaternary Research, v. 16, no. 1, p. 48-65.US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/. |
| NGMDB product | |
| Counties | Aroostook |