Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Maine
|Name||Devonian - Silurian Madrid Formation|
|Geologic age||Devonian - Silurian|
|Original map label||DSm|
|Comments||Probably named for Madrid, ME. Consists of calcareous quartzite with lime-silicate minerals in middle-grade metamorphic zones. Contains minor amounts of argillaceous rocks and calcareous beds. Sulfides absent or inconspicuous. Quartzite grades upward into Dyer Hill member (new). Age is younger than Parmachenee formation (new). (ME031) Unit description from USGS GEOLEX website (ME078). AA - Low rank amphibolite facies; Protolith M - Calcareous sandstone; interbedded sandstone and impure limestone To avoid digital confusion with Dsm, the map symbol for this unit (DSm) has been changed to DSmd in this file and on the digital map.|
|Primary rock type||quartzite|
|Secondary rock type||calc-silicate rock|
|Other rock types|
Metamorphic > Metasedimentary > Calc-silicate-rockAA - Low rank amphibolite facies; Protolith M - Calcareous sandstone; interbedded sandstone and impure limestone
Metamorphic > Metasedimentary > Metaclastic > QuartziteAA - Low rank amphibolite facies; Protolith M - Calcareous sandstone; interbedded sandstone and impure limestone
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.
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.
|Geographic coverage||Aroostook - Franklin - Kennebec - Oxford - Penobscot - Piscataquis - Somerset|
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