Black, chiefly massive to porphyritic. Includes minor rhyolitic ignimbrite and andesitic tuff. Part of Ossipee Mountain Complex of Kingsley (1931)
State New Hampshire
Name Basalt
Geologic age Cretaceous
Lithologic constituents
Igneous > Volcanic > Mafic-volcanic > Basalt
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff)andesitic tuff
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic)minor rhyolitic ignimbrite
Comments Part of the New England-Quebec igneous province of McHone and Butler (1984). Overall, part of the White Mountain Plutonic-Volcanic Suite - Includes Cretaceous alkalic syenite to granitic to gabbroic plutons, minor volcanic rocks, and lamprophyre dikes of the New England-Quebec igneous province of McHone and Butler (1984); also includes Jurassic granite and syenite and less abundant quartz syenite, diorite, gabbro, nepheline syenite, and volcanic rocks of the White Mountain igneous province of McHone and Butler (1984).

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.

McHone, J.G., and Butler, J.R., 1984, Mesozoic igneous provinces of New England and the opening of the North Atlantic Ocean: Geological Society of America Bulletin, v. 95, p. 757-765.

Kingsley, Louise, 1931, Cauldron subsidence of the Ossipee Mountains: American Journal of Science, v. 12, p. 134-167.

NGMDB product
Counties Carroll