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Fanglomerate from the western margin of the Triassic-aged Culpeper Basin rift valley in northern Virginia.
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This porphyritic (olivine phenocrysts) vesicular basalt was collected from a roadcut on the southwest rift zone of Mauna Loa in Hawaii. I believe that it is from the 1907 lava flows in that area, though I'm not certain of that. I'm curious to see how the focus will work on a relatively flat (but not cut) surface. Th...
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