Photographer: Calvin J. Hamilton Copyright: © 2003 Calvin J. Hamilton Date: 2003/07/24 Location: Petroglyph National Monument, Boca Negra Canyon, New Mexico

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Caption

Several east-facing structures have been found on escarpment promontories and some may still have importance to present day Pueblo peoples. Similar structures elsewhere were used by Hispanicd shepherds as sheep pens. This point provides an excellent view to the west of cinder cones of the Albuquerque volcanoes. They erupted about 140,000 years ago, but are not extinct.