From sangres.com - "The Kasha-Katuwe Tent Rocks National Monument (4,645 acres) is an area on the Pajarito Plateau where erosion has shaped the layers of volcanic ash in a very unique way. The volcanic ash was deposited during eruptions from the Valle Caldera area in the heart of the Jemez Mountains 6 to 7 million years ago. The pumice, ash and tuff deposits are more than 1,000' thick. The volcanic eruptions were so violent that you can still find pieces of translucent obsidian ("apache tears") that were created by rapid cooling in the aftermath of the pyroclastic flows."
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