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These are chunks of rocks from the volcanic activity in the area of northern New Mexico. Lava rocks lay all about when we'd go hiking or running or walking around the mesas. The small black rock is a rounded piece of obsidian. The cave dwellers of the ancient communities around the area used this natural volcanic glass to make sharp arrow points.
I'm still marveling over the Valles Caldera. We could see the volcano shell easily from our flight now that we knew where and what to look for.
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