Devonian Hobbstown Formation

Devonian Hobbstown Formation
State Maine
Name Devonian Hobbstown Formation
Geologic age Devonian
Lithologic constituents
Major
Sedimentary > Clastic > ConglomerateGS - Greenschist facies; Protolith H - Lithic sandstone and conglomerate
Sedimentary > Clastic > Sandstone > ArkoseGS - Greenschist facies; Protolith H - Lithic sandstone and conglomerate
Comments Usage follows that of Pollock (1987) who assigns it to the Seboomook Group. Occurs in central Maine trough. Consists of thinly bedded calc-silicate rocks, white marble, volcaniclastic graywacke, and black, sulfidic schist. Includes separately mapped euxinic black shale member. Remnants of Hildreths occur in migmatitic gneiss of overlying Mount Blue Formation of Seboomook Group. Age is Early Devonian. (ME011) Unit description from USGS GEOLEX website (ME078). AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies; Protolith S - Interbedded pelite, sandstone, and limestone and/or dolostone.
References
NGMDB product
Counties Somerset