Devonian granodiorite - quartz syenite (porphyritic texture) (MED2-4b(x);0)

Devonian granodiorite - quartz syenite (porphyritic texture) - Devonian porphyritic biotite granodiorite to quartz syenite - porphyritic biotite granodiorite, porphyritic biotite tonalite, porphyritic alkali feldspar-biotite quartz syenite, and porphyritic biotite quartz syenite.

State	Maine
Name	Devonian granodiorite - quartz syenite (porphyritic texture)
Geologic age	Devonian
Original map label	D2-4b(x)
Comments	U - Unmetamorphosed
Primary rock type	granodiorite
Secondary rock type	tonalite
Other rock types	quartz syenite
Lithologic constituents
Map references	Digital bedrock data downloaded from Maine Office of GIS in September 2005 from http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock Bedrock units table (publication date 11/15/2002) downloaded from same site. Permission to redistribute these data granted by Dr. Robert Marvinney, State Geologist of Maine, in September 2006. [http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock]
Unit 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. Gaudette, H.E., and Boone, G.M., 1985, Isotopic age of the Lexington batholith: constraints on timing of intrusion and Acadian metamorphism in western Maine: Geol. Soc. Amer., Abs. with Prog, v. 17, p. 19-20. Naylor, R.S., 1973, Age of the Lexington batholith, Maine: Geol. Soc. Amer., Abs. with Prog., v. 5, p. 200.
Geographic coverage	Franklin - Somerset