Tertiary intrusive rocks (hypabyssal), unit 3 (Pinnacles Volcanic Field)

Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. Includes some Mesozoic rocks.
State California
Name Tertiary intrusive rocks (hypabyssal), unit 3 (Pinnacles Volcanic Field)
Geologic age Tertiary
Lithologic constituents
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Dike or sill)
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-andesite (Dike or sill)
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-dacite (Dike or sill)

Ludington, Steve, and Gray, Karen, 1987, Petrochemical studies of the Pinnacles Wilderness contiguous wilderness study area, Monterey and San Benito Counties, California. U.S. Geological Survey Open-file report 87-135, 9 p.


Jennings, C.W., Strand, R.G., Rogers, T.H., Boylan, R.T., Moar, R.R., and Switzer, R.A., 1977, Geologic Map of California: California Division of Mines and Geology, Geologic Data Map 2, scale 1:750,000.

NGMDB product
Counties Monterey - San Benito