daemn42 | Old Quarry Ridge Runs @daemn42 | Uploaded September 2021 | Updated October 2024, 12 hours ago.
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I sometimes like to stop beside the highway and fly this 100 year old quarry.

This ridge has an interesting history. It's part of the Laramie Formation which contains sub-bituminous coal. In addition to quarrying rock and clay the first coal mine was near the surface at the south end of this ridge, where this layer is tipped up vertically. Then the nearby Leyden Coal Mine went straight down into the deeper horizontal strata and supplied 6 million tons of coal to Denver for 50 years.