Silicic vent deposits

Complex domal masses of rhyolite and dacite that include near-vent flows, breccia, pumicite, perlite, obsidian, and ash-flow tuff
State Oregon
Name Silicic vent deposits
Geologic age Pliocene to Pleistocene
Lithologic constituents
Igneous > Volcanic > Felsic-volcanic > Dacite (Dome, Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Dome, Pyroclastic)
NGMDB product
Counties Deschutes - Klamath - Lake - Wallowa