Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > New Hampshire
|Name||Trondhjemite and quartz diorite in northern Jefferson dome in Gorham quadrangle|
|Geologic age||Late Ordovician|
|Original map label||Oo3B-6|
|Comments||Part of the Oliverian Plutonic Suite (Late Ordovician) - Pink, weakly to moderately foliated, locally porphyritic biotite granitoids found in mantled gneiss domes. Mafic varieties contain hornblends. Variably metamorphosed up to amphibolite facies.|
|Primary rock type||trondhjemite|
|Secondary rock type||quartz diorite|
|Other rock types|
Igneous > Plutonic > Dioritic > Quartz-diorite (Pluton)
Igneous > Plutonic > Granitic > Tonalite > Trondhjemite (Pluton)
Bennett, D. S, , Wittkop, C.A., and Dicken, C.L., 2006 , Bedrock Geologic Map of New Hampshire - A Digital Representation of the Lyons and others 1997 map and ancillary files: U.S. Geological Survey Data Series 215, scale 1:250,000, CD-ROM.
Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock Geologic Map of New Hampshire: Reston, VA, U.S. Geological Survey Special Map, 1:250,000, 2 sheets.
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