Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Maine
|Name||Devonian Hildreths Formation|
|Original map label||Dh|
|Comments||Usage follows that of Pollock (1987) who assigns it to the Seboomook Group. Occurs in central Maine trough. Consists of thinly bedded calc-silicate rocks, white marble, volcaniclastic graywacke, and black, sulfidic schist. Includes separately mapped euxinic black shale member. Remnants of Hildreths occur in migmatitic gneiss of overlying Mount Blue Formation of Seboomook Group. Age is Early Devonian. (ME011) Unit description from USGS GEOLEX website (ME078). AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies; Protolith S - Interbedded pelite, sandstone, and limestone and/or dolostone|
|Primary rock type||calc-silicate rock|
|Secondary rock type||marble|
|Other rock types||graywacke; schist|
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||Franklin - Oxford - Piscataquis - Somerset|
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