|Name||Cape Ann Complex - Squam Granite|
|Geologic age||Lower Silurian or Upper Ordovician|
Igneous > Plutonic > Dioritic > MonzodioriteFine- to medium-grained monzodiorite.
|Comments||Part of Milford-Dedham Zone (Tertiary and Older Rocks). Secondary unit description per MA020.|
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., and Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
Hon, Rudolph, Paige, M.L. and Loftenius, C.J., 1993, Petrogenesis of two diverse mid-Paleozoic complexes of eastern Massachusetts; A-type Cape Ann Granite and I-type Sharpners Pond Quartz Diorite, IN Cheney, J.T., and Hepburn, J.C., eds., Field trip guidebook for the northeastern United States; 1993 Boston GSA; Volume 2: University of Massachusetts, Geology Department Contribution, no. 67, Joint annual meeting of Geological Society of America, and New England Intercollegiate Geological Conference, 85th, Boston, MA, October 25-28, 1993, p. Q1-Q28.