Gray biotite granite

Contains minor muscovite. Found in Milford quadrangle.
State New Hampshire
Name Gray biotite granite
Geologic age Permian
Lithologic constituents
Major
Igneous > Plutonic > Granitic > GraniteGray biotite granite - Contains minor muscovite.
Comments Granite, Milford quadrangle = 280+/-5 U/Pb, monazite, 275+/-? (approx) U/Pb, zircon per NH038.
References

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, 2 sheets, scale 1:250,000.

https://ngmdb.usgs.gov/Prodesc/proddesc_37338.htm

Aleinikoff, J.N., Zartman, R.E., and Lyons, J.B., 1979, U-Th-Pb geochronology of the Massabesic Gneiss and the granite near Milford, south-central New Hampshire; new evidence for Avalonian basement and Taconic and Alleghenian disturbances in eastern New England: Contributions to Mineralogy and Petrology, v. 71, p. 1-11.

NGMDB product
Counties Hillsborough