|Name||Silurian Spragueville Formation|
Sedimentary > Carbonate > Limestone (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith R - Interbedded pelite and limestone and/or dolostone
Sedimentary > Clastic > Mudstone (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith R - Interbedded pelite and limestone and/or dolostone
|Comments||Consists of well-bedded metasandstone, thinly laminated metasiltstone, and metashale. Thin medial unit of metalimestone. Thought to be fine-grained facies of Sangerville Formation and is assigned as a member (after usage of Pankiwskyj, 1979). About 1,000 m thick. Gradationally overlies Patch Mountain Member of Sangerville Formation. (ME041). Anasagunticook Member reassigned from Sangerville Formation to Waterville Formation following usage of Osberg (1988). Not shown separately on this map to simplify nomenclature. Rocks previously mapped as Anasagunticook Member of Sangerville Formation in the Bryant Pond, Buckfield, Dixfield, and Farmington 15-min quads are here shown as Waterville Formation (queried). Anasagunticook correlated with Waterville by Osberg (1988) on the basis of lithologic similarity. (ME004) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; Protolith Q - Interbedded pelite and sandstone|
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.
Pavlides, L., 1966, Meduxnekeag Group and Spraugueville Formation of Aroostook County, northeast Maine, in Cohee, G.V., and West, W.S., Changes in stratigraphic nomenclature in the U.S. Geological Survey - 1965: U.S. Geological Survey Bull. 1244-A, p. 52-60.
Pavlides, L., 1968, Stratigraphic and facies relationships of the Carys Mills Formation of Ordovician and Silurian age, northeast Maine: U.S. Geological Survey Bull. 1264, p. 44.