The Austin Bluffs Open Space is comprised of 584 acres. The United States Forest Service has ranked this open space as “unique” in the National Feature Inventory for its distinctive rock formations. One rock formation dates back to the Ecocene period of the Tertiary, other formations include the Denver formation, Arapahoe formation, and the Dawson arkose. Following the most recent period of regional geologic uplift, about 65 to 70 million years ago, sedimentary sandstone and arkosic sandstone units.
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