Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-ash flow)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic-air fall, Pyroclastic-ash flow)Containsrhyolitic to andesitic ash-flow tuff, pumice fall deposits, minor mudflows,and alluvium on flanks of newberry Volcano