OF-05-06 Geologic Map of the Sedalia Quadrangle, Douglas County, Colorado

Describes the geology, structural geology, mineral and water resources, and geologic hazards of this 7.5-minute quadrangle located northwest for the town of Castle Rock in central Colorado. Digital PDF Download. OF-05-06D

From the Author’s Notes:

The Sedalia 7.5-minute quadrangle is located in Douglas County, just east of the Colorado Front Range. The town of Sedalia (2000 CENSUS population of 211) is located near the center of the quadrangle, along Highway 85. The town of Castle Rock (2000 CENSUS population of 20,224), located a few miles southeast of the quadrangle boundary, is the largest urban area nearby and serves as the seat of Douglas County. Plum Creek and West Plum Creek, the major drainages in the quadrangle, flow northward to meet the South Platte River near Denver. The highest point on the quadrangle is the rhyolite-capped butte in sec. 4 of T. 8 S., R. 67 W. (elevation 6,691 feet), and the lowest point (elevation 5,598 feet) is the Plum Creek valley bottom in the northwestern part of the quadrangle.

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Morgan, M. L., J. McHarge, and P. E. Barkmann. “OF-05-06 Geologic Map of the Sedalia Quadrangle, Douglas County, Colorado.” Geologic. Open File Reports. Denver, CO: Colorado Geological Survey, Department of Natural Resources, 2006. https://coloradogeologicalsurvey.org/publications/geologic-map-sedalia-quadrangle-douglas-colorado.