State | Oregon |
---|---|
Name | Basalt and andesite intrusions |
Geologic age | Oligocene(?) to Pliocene |
Lithologic constituents | Major
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-andesite (Dike or sill, Stock or pipe)
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-basaltic-andesite (Dike or sill, Stock or pipe)
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-basalt (Dike or sill, Pyroclastic-tuff)
|
References | Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000. |
NGMDB product | |
Counties | Clackamas - Douglas - Hood River - Jackson - Jefferson - Klamath - Lane - Linn - Malheur - Marion - Multnomah |