| State | Maine |
|---|---|
| Name | Silurian Edmunds Formation |
| Geologic age | Silurian |
| Lithologic constituents | Major
Igneous > Volcanic > Felsic-volcanicGS - Greenschist facies; Protolith W - Mafic to felsic volcanic rocks
Igneous > Volcanic > Mafic-volcanicGS - Greenschist facies; Protolith W - Mafic to felsic volcanic rocks
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| Comments | Ames Knob formation named in Penobscot Bay area, Knox Co., ME. Consists of limestones and red shales, with several conglomerate beds and a basal conglomerate member, which is 16 ft thick. Contains Niagara fossils. Thickness 580 ft. Rests on North Haven greenstone. Overlain by volcanic rocks. (ME025) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; Protolith S - interbedded pelite, sandstone, and limestone and/or dolostone. |
| 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.Berry, W.B.N., and Boucot, A.J., 1970, Correlation of the North American Silurian Rocks: Geol. Soc. Amer., Special Paper 102, 289 p. |
| NGMDB product | |
| Counties | Washington |