Named for Chiputneticook Lakes, International Boundary, Maine and New Brunswick. Outcrops most common in Danforth, Forest and Vanceboro quads. Consists of light-gray to gray, coarse-grained, biotitic, porphyritic quartz monzonite to granite; average grain size exceeds 0.25 in.; where porphyritic, euhedral potassic feldspar phenocrysts 0.25 in. by 1 in. to 0.5 by 2 in. in places show rapakivi texture. Porphyritic texture commonly extends to within a few feet of border of pluton. Is stratigraphic equivalent of granite and quartz monzonite in Danforth quad. Age determined by K-Ar as 400 m.y. in Danforth quad (Faul and others, 1963) and 380 m.y. in Fosterville, N.B., area (Tupper and Hart, 1961). Intrudes rocks of Silurian age. Age is Devonian.

Source: GNU records (USGS DDS-6; Reston GNULEX).