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Geology and petrology of the Greenville quadrangle, Piscataquis and Somerset Counties, Maine

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Geology and petrology of the Greenville quadrangle, Piscataquis and Somerset Counties, Maine; 1967; B; 1241-F; USGS NUMBERED SERIES; Contributions to general geology, 1966; Espenshade, Gilbert H.; Boudette, Eugene L.

Summary

In the Greenville quadrangle, west-central Maine, slate, siltstone, and sandstone (calcareous and noncalcareous) of probable Silurian to Early Devonian age are intruded by a large mafic pluton and two granitic stocks of probable Early Devonian age. Ages of the sedimentary rocks are based upon tentative correlations with fossiliferous beds in adjacent quadrangles because the few fossils in the Greenville quadrangle are nondiagnostic; ages of the intrusive rocks are based upon radiometric age determinations. The sedimentary rocks are tightly folded about northeast-trending axes and have strong slaty cleavage. Widespread graded bedding is very useful in determining the tops of beds and thus the location of fold axes. The sedimentary rocks [...]

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Type Scheme Key
local-index unknown b1241F
local-pk unknown 34336
series unknown Bulletin

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languageEnglish
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