State | Oregon |
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Name | Mafic vent complexes |
Geologic age | Late Miocene to Pleistocene |
Lithologic constituents | Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Dike or sill, Pyroclastic)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Dike or sill, Pyroclastic)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow, Dike or sill, Pyroclastic)
|
Comments | Unit is in a north-south zone along crest of Cascades and includes Newberry volcano. |
References | Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.Waters, A.C., 1968, Reconnaissance geologic map of the Madras quadrangle, Jeffereson and Wasco Counties, Oregon" U.S. Geological Survey Miscellaneous Geological Investigations Map I-555, scale 1;125,000.https://pubs.er.usgs.gov/publication/i555 |
NGMDB product | |
Counties | Clackamas - Crook - Deschutes - Douglas - Hood River - Jackson - Jefferson - Klamath - Lane - Linn - Marion - Multnomah - Wasco |