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Photo ID: h57pwa	Subject: Volcanoes	Description
	Calderas; Craters; Dacite; Domes; Geologic Hazards; Igneous Rocks; Intrusions; Mountains; Peaks; Pipes; Plate Tectonics; Plugs; Plutonic Rocks; Rhyolite; Tectonics; Volcanic Features; Volcanic Necks; Volcanic Rocks; Volcanics; Volcanology	Rhyolitic plug dome (dacite) at Lassen Peak.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; California; Lassen Peak
Photo Quality \| Large	Available for Commercial Use

Photo ID: h57szt	Subject: Volcanoes	Description
	Calderas; Craters; Dacite; Domes; Geologic Hazards; Igneous Rocks; Intrusions; Mountains; Peaks; Pipes; Plate Tectonics; Plugs; Plutonic Rocks; Rhyolite; Tectonics; Volcanic Features; Volcanic Necks; Volcanic Rocks; Volcanics; Volcanology	Lassen Peak in California.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; California; Lassen Peak
Photo Quality \| Large	Available for Commercial Use

Photo ID: h8tbwe	Subject: Igneous Rocks	Description
	Alaska Range; Basalt; Hills; Landscape; Petrology; Plutonic Rocks; Rhyolite; Volcanic Rocks	Polychrome Pass, the halfway point on teh Denali Park road) shows 41 to 61 million year old basalt (dark rock) and rhyolite (light rock) interbedded as lava flows. Photo by P. Brease.
	Photographer	Location
	NPS Credit Line: Courtesy National Park Service	North America; United States; Alaska; Denali National Park
Photo Quality \| Large	Available for Commercial Use

Photo ID: hhrpdk	Subject: Igneous Rocks	Description
	Domes; Landscape; Mountains; Quaternary; Rhyolite; Volcanic Features; Volcanic Rocks; Volcanism; Volcanoes	Big Southern Butte (7576 ft.), 20 miles east of Craters of the Moon National Monument, ID. View to the east. April 1966. View Geological Time Scale for this image.
	Photographer	Location
	Louis Maher Credit Line: Copyright © Louis Maher	North America; United States; Idaho; Big Southern Butte
Photo Quality \| Large	Available for Commercial Use

Photo ID: hmwoky	Subject: Landscape	Description
	Hoodoos; Oligocene; Rhyoloite; Tertiary; Tuff; Volcanic Rocks	Hoodoos in the Echo Canyon Rhyolite, a tuff formed by explosive volcanism 26.9 million years ago. View Geological Time Scale for this image.
	Photographer	Location
	Larry Fellows Credit Line: Copyright © Larry Fellows, Arizona Geological Survey	North America; United States; Arizona; Chiricahua National Monument
Photo Quality \| Large	Available for Commercial Use

Photo ID: hmworu	Subject: Igneous Rocks	Description
	Echo Canyon Rhyolite; Erosion; Erosional Features; Landforms; Rhyolite; Surface Processes; Volcanic Rocks	Erosion of the Echo Canyon Rhyolite has produced bizarre landforms.
	Photographer	Location
	Larry Fellows Credit Line: Copyright © Larry Fellows, Arizona Geological Survey	North America; United States; Arizona; Chiricahua National Monument
Photo Quality \| Large	Available for Commercial Use

Photo ID: hszs5m	Subject: Igneous Rocks	Description
	Ash; Pumice; Rhyolite; Surge Bed; Volcanic Ash; Volcanic Features; Volcanic Rocks; Volcanism; Volcanoes; Volcanology	A surge bed of volcanic ash (white) grades upward into coarser particles (brown) of pumice, rock fragments, and ash settled during an explosive eruption and formed the Echo Canyon Rhyolite.
	Photographer	Location
	Larry Fellows Credit Line: Copyright © Larry Fellows, Arizona Geological Survey	North America; United States; Arizona; Chiricahua National Monument
Photo Quality \| Large	Available for Commercial Use

Photo ID: hszscl	Subject: Volcanoes	Description
	Ash; Glass; Igneous Rocks; Petrology; Plutonic Rocks; Pumice; Rhyolite; Volanology; Volcanic Ash; Volcanic Rocks; Volcanism	The Echo Canyon Rhyolite formed when a mixture of hot gas, ash, pumice (lightest color) and rock fragments, and glass shards was violently erupted from a volcano, fell to the ground. The fragments were welded together and compacted.
	Photographer	Location
	Larry Fellows Credit Line: Copyright © Larry Fellows, Arizona Geological Survey	North America; United States; Arizona; Chiricahua National Monument
Photo Quality \| Large	Available for Commercial Use

Photo ID: hszsex	Subject: Surface Processes	Description
	Erosion; Erosional Features; Exfoliation; Exfoliation; Igneous Rocks; Lichen; Petrology; Plutonic Rocks; Rhyolite; Rocks; Weathering; Weathering	This rhyolite, which shows exfoliation shingles, is being attacked by lichens.
	Photographer	Location
	Larry Fellows Credit Line: Copyright © Larry Fellows, Arizona Geological Survey	North America; United States; Arizona; Chiricahua National Monument
Photo Quality \| Large	Available for Commercial Use

Photo ID: hszsh7	Subject: Surface Processes	Description
	Ash; Cliffs; Erosional Features; Fissures; Fractures; Geologic Hazards; Igneous Rocks; Joints; Petrology; Rhyolite; Rockfall; Weathering	The soft volcanic ash (white) was eroded from this cliff face, leaving the overlying rhyolite unstable. After a rain, which filled the joints in the rhyolite and saturated the ash, a rockfall occurred.
	Photographer	Location
	Larry Fellows Credit Line: Copyright © Larry Fellows, Arizona Geological Survey	North America; United States; Arizona; Chiricahua National Monument
Photo Quality \| Large	Available for Commercial Use

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