| State | Maine |
|---|---|
| Name | Devonian Carrabassett Formation, massive pelite member |
| Geologic age | Devonian |
| Lithologic constituents | Major
Sedimentary > Clastic > MudstoneProtolith A - Pelite; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist facies; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies.
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| Comments | Type locality designated as along east bank of south branch of Presque Isle Brook, about 1 mi from south line of Chapman Township and 1 mi west of Tweedy on road running southwest from Presque Isle. Consists mainly of thick-bedded sandstones with some shaly layers. Thickness exceeds 500 ft. Fauna seem to correlate closely with Lower Oriskany of NY as recognized at Becraft, and indicates that Chapman is older than Mapleton and Moose River sandstones and younger than Square Lake limestone. (ME006) Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith D - Lithic 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.Espenshade, G.H., and Boudette, E.L., 1967, Geology and petrology of the Greenville quadrangle, Piscataquis and Somerset Counties, Maine: U.S. Geol. Surv., Bull. 1241-F, 60 p. |
| NGMDB product | |
| Counties | Franklin - Piscataquis - Somerset |