The elevation of the national Monument ranges from 5570 feet to 6760 feet above sea level. The cone shaped tent rock formations are the product of volcanic eruptions that occurred 6 to 7 million years ago and left pumice, ash and tuff deposits over 1000 feet thick. The complex landscape and spectacular geologic scenery of the national monument it has been a focal point for visitors for centuries.. Surveys have recorded many archaeological sites reflecting human occupation spanning 4000 years.
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