Devonian - Silurian Daggett Ridge Formation (MEDSdr;0)

State	Maine
Name	Devonian - Silurian Daggett Ridge Formation
Geologic age	Devonian - Silurian
Original map label	DSd
Comments	The generally conglomeratic rocks are grouped as the Daggett Ridge Formation, which is considered to be approximately time-equivalent to the other three and therefore is probably a more proximal facies. All four (Daggett Ridge, Mill Priveledge Brook, Sam Rowe Ridge, and Ellen Wood Ridge Formations) appear to interfinger. The Daggett Ridge consists almost entirely of massive clast-supported conglomerates. It is exposed in the northwest corner of the Wytopitlock quad and the northeast corner of the Danforth quad. Clast sizes range from pebble-to-cobble size over most of the unit but in some areas of the Danforth quad, reach boulder-size (10 to 12 ft across). Clast lithology is dominated by quartzofeldspathic wackes similar to those of the Baskahegan Lake Formation. (ME028) Unit description from USGS GEOLEX website (ME078). Unit symbol is DSd on printed map. This leads to digital confusion with Dsd. Thus, the map symbol for the Daggett Ridge Formation has been changed to DSdr in this file and in the digital map file. GS - Greenschist facies Protolith H - Lithic sandstone and conglomerate
Primary rock type	sandstone
Secondary rock type	conglomerate
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > ConglomerateGS - Greenschist facies Protolith H - Lithic sandstone and conglomerate Incidental Sedimentary > Clastic > SandstoneGS - Greenschist facies Protolith H - Lithic sandstone and conglomerate
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. Hopeck, John, 1994, Post-Caradocian strata of the Miramichi anticlinorium and their relation to the Aroostook-Matapedia belt; A4, IN Hanson, L.S., ed., Guidebook to field trips in north-central Maine: New England Intercollegiate Geological Conference Guidebook, [86th] Annual Meeting, Millinocket, ME, September 23-25, 1994, p. 1-17. USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Aroostook - Washington