Silurian Spragueville Formation (MESspr;0)

State	Maine
Name	Silurian Spragueville Formation
Geologic age	Silurian
Lithologic constituents	Major 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
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. 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. https://pubs.er.usgs.gov/publication/b1244A 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. https://pubs.er.usgs.gov/publication/b1264
NGMDB product	NGMDB product page for 16547
Counties	Aroostook

State

Name

Silurian Spragueville Formation

Geologic age

Silurian

Lithologic constituents

Major

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

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.

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.

https://pubs.er.usgs.gov/publication/b1244A

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.

https://pubs.er.usgs.gov/publication/b1264

NGMDB product

NGMDB product page for 16547

Counties

Aroostook