Robert W. Limbert and his exploration party stop to pose on a large volcanic mass. Two men stand on parts of the volcanic rock, while another man sits inside. Limbert's note: "Pueblo Ruin of Volcanic Tufa. These peculiar masses were formed when molten lava undermined the sides of a crater, large pieces of which broke off and fell on top of the flow. The fragments are usually black of various shades of red, and when viewed from a distance resemble the Pueblo ruins of the Southwest. They are from 10 to 80 feet in height and of many curious shapes."

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