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Fine-grained hornblende diorite

Fine-grained hornblende diorite - In Connecticut River bed, near French King Rock.
StateMassachusetts
NameFine-grained hornblende diorite
Geologic agePrecambrian to Paleozoic
Original map labeldi
CommentsPart of Connecticut Valley Belt (Silurian and Devonian Rocks) age uncertain
Primary rock typediorite
Secondary rock type
Other rock types
Lithologic constituents
Major
Igneous > Plutonic > Dioritic > Dioritefine-grained hornblende diorite
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
Geographic coverageFranklin

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