Beyond the Rio Grande, Albuquerque is bordered on the west side by a low, barren, volcanic plateau West Mesa - 200 feet high and extending for over 15 miles, the only feature rising above the flat grasslands are the cones of several long-extinct volcanoes. More interesting is the eastern edge, a steep slope of broken lava blocks, since here are found approximately 24,000 petroglyphs, most dating from the Ancestral Pueblo period of 1300 to 1600 AD, made by chipping away the dark, weathered surface of the lava to reveal the light-colored rock underneath.
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