Devonian Swanback Formation (MEDsb;0)

State	Maine
Name	Devonian Swanback Formation
Geologic age	Devonian
Original map label	Dsb
Comments	W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith A - Pelite
Primary rock type	mudstone
Secondary rock type
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > MudstoneW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith A - Pelite
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. Boucot, A.J., Field, M.T., Fletcher, R., Forbes, W.H., Naylor, R.S., and Pavlides, L., 1964, Reconnaissance bedrock geology of the Presque Isle quadrangle, Maine: Maine Geol. Surv., Bull. 15, 117 p.
Geographic coverage	Aroostook - Penobscot