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
Major
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Dike or sill)
Incidental
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-andesite (Dike or sill)
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-dacite (Dike or sill)
References

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.

https://pubs.er.usgs.gov/publication/ofr87135

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