Devonian - Silurian undifferentiated sedimentary rocks of the Spider Lake, Chandler Pond and Third Lake Formations (MEDSs;0)

State	Maine
Name	Devonian - Silurian undifferentiated sedimentary rocks of the Spider Lake, Chandler Pond and Third Lake Formations
Geologic age	Devonian - Silurian
Original map label	DSs
Comments	W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith S - Interbedded pelite, sandstone, and limestone and/or dolostone
Primary rock type	sandstone
Secondary rock type	mudstone
Other rock types	limestone; dolostone (dolomite)
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. Hall, B.A., 1970, Stratigraphy of the southern end of the Munsungun anticlinorium, Maine: Maine Geol. Surv., Bull. 22, 63 p.
Geographic coverage	Aroostook - Penobscot - Piscataquis