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Cliffs of ash flow tuff, Colorado

Cliffs of ash flow tuff, Central San Juan Volcanic Field, Colorado. (160914-34)

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Large block in ash flow tuff, Colorado

Large block in ash flow tuff, Central San Juan Volcanic Field, Colorado. (160914-33)

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Large block in ash flow tuff with person

Geologist and large block in ash flow tuff, Central San Juan Volcanic Field, Colorado. (160914-31)

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Large block in tuff (vertical)

Large block in ash flow tuff, Central San Juan Volcanic Field, Colorado. (160914-24)

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Fish Canyon Ash flow tuff, Colorado

Fish Canyon Ash flow tuff, San Juan Mountains, Colorado (160913-23)

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Fish Canyon Ash flow tuff, Colorado

Fish Canyon Ash flow tuff, San Juan Mountains, Colorado (160913-22)

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Chemical alteration, Colorado

Colorful, chemically-altered volcanic rocks of Little Red Mountain of the San Juan Mountains, Colorado (160912-20)

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Chemical alteration, Colorado

Colorful, chemically-altered volcanic rocks of Little and Big Red Mountains of the San Juan Mountains, Colorado (160912-19)

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Ash flow tuff, Colorado

Ash flow tuff, Colorado (160912-15)

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Ash flow tuff, Colorado

Ash flow tuff, Colorado (160912-14)

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Rio Grande River Canyon, NM (square)

Rio Grande River Canyon, New Mexico (190911-57)

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Vesicles (gas bubbles) in basalt.

Vesicles (gas bubbles) in Pliocene age Servilleta Basalt, New Mexico. (160911-45)

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Vesicle pipe in basalt

Pipe of vesicles (gas bubbles) in Pliocene age Servilleta Basalt, New Mexico. (160911-41)

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Vesicles (gas bubbles) in basalt (vertical)

Vesicles (gas bubbles) in Pliocene age Servilleta Basalt, New Mexico. (160911-39)

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Vesicles (gas bubbles) in basalt.

Vesicles (gas bubbles) in Pliocene age Servilleta Basalt, New Mexico. (160911-38)

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Paleosol beneath andesite, New Mexico

Close-up view of paleosol beneath Pliocene-age andesite lava flow, New Mexico. Note basal flow breccia. (160911-32)

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Paleosol beneath andesite, New Mexico

Paleosol and students beneath Pliocene-age andesite lava flow, New Mexico (160911-29)

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Paleosol beneath andesite, NM (vertical)

Paleosol beneath Pliocene-age andesite lava flow, New Mexico. Note basal flow breccia. (160911-27)

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Paleosol beneath andesite flow, New Mexico

Paleosol beneath Pliocene-age andesite lava flow, New Mexico. Note basal flow breccia. (160911-26)

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Paleosol beneath andesite flow, New Mexico

Paleosol beneath Pliocene-age andesite lava flow, New Mexico (160911-20)

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Paleosol beneath andesite flow, New Mexico

Paleosol beneath Pliocene-age andesite lava flow, New Mexico (160911-17)

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