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fhopson: Plagioclase phenocrysts in dike
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fhopson: Mafic inclusions in Desolation Valley granodiorite
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fhopson: Devils Tower Phonolite
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fhopson: Devils Tower phonolite
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fhopson: Potassium feldspar megacrysts in Topaz Granodiorite
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fhopson: K-spar megacryst in Topaz Granodiorite
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fhopson: Peperites in the Taylor Formation, northern Sierra Nevada
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fhopson: Peperites in the Taylor Formation, northern Sierra Nevada
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fhopson: Peperites in the Taylor Formation, northern Sierra Nevada
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fhopson: Peperites in the Taylor Formation, northern Sierra Nevada
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fhopson: Conglomerate
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fhopson: Conglomerate
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fhopson: May 19-20, 1915 dacite, Lassen Volcanic National Park
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fhopson: Mafic Inclusions at Donner Lake Overlook
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fhopson: Black Butte dacite, California
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fhopson: Prida Formation
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fhopson: Garnet blue schist, Ring Mtn-Tiburon Peninsula, CA
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fhopson: Flow banding in rhyodacite of King's Creek, Lassen Volcanic National Park, CA
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fhopson: Fiamme in Bishop Tuff in Owens River Gorge near Mammoth Lakes, CA
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fhopson: Fiamme and hornfels clasts in Bishop Tuff in Owens River Gorge near Mammoth Lakes, CA.
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fhopson: 29 Palms quartz monzonite at Indian Cove, Joshua Tree National Park, CA.