Pahoehoe lava, Hawaii.
volcanic, basaltic, mafic, igneous, extrusive
Pahoehoe lava break-out, Hawaii.
volcanic, basaltic, mafic, igneous, extrusive
Cinder cone and flow, California
volcanic, igneous, Cascade volcanoes
Pahoehoe and Pele’s Hair, Hawaii.
ropy, volcanic, igneous
Crater Lake and Wizard Island, Oregon
volcanic, Cascade volcanoes
Rhyolitic obsidian flow, Oregon.
volcanic, rhyolite, RGO, dwshed
Intrusive hand samples
specimens, igneous, intrusive
Ash Flow tuff, Crater Lake, (vertical)
differential erosion, volcanic, pyroclastic, weathering, RGO, Cascade volcanoes
Pyroclastic rock, Oregon Cascades
Cascade volcanoes
Edge of rhyolite flow, N. California
Cascade volcanoes
Vitrophyre in welded tuff, SE California
pyroclastic, volcanic
Mt. St. Helens and crater, 2014
stratovolcano, Cascade volcanoes
Colonnade in basalt, Oregon
CRBG, columns, columnar, colonnade
Pumice Deposit
RGO, pyroclastic