OF-07-01 Geologic Map of the Olathe Quadrangle, Montrose County, Colorado


The purpose of this report is to describe the geologic setting, mineral and ground-water resources, and geologic hazards of this 7.5-minute quadrangle located north of Montrose in western Colorado. Staff geologists Matthew L. Morgan and David C. Noe, along with summer volunteer geologist Stephen M. Keller completed the field work on this project during the spring of 2006. Matt Morgan was the principal mapper and author of this report and utilized the maps and filed notes generated by all three investigators. Some unit descriptions were coordinated between this area and the Montrose East quadrangle (Noe et al, 2007). Digital ZIP/PDF download. OF-07-01D

From the Author’s Notes:

The Olathe 7.5-minute quadrangle is located in Montrose County, Colorado, between the Uncompahgre and Gunnison uplifts. The Town of Olathe (2000 census population of 1,573) is located in the northwest part of the quadrangle along State Highway 50. The Uncompahgre River runs through the western half of the quadrangle and flows northward to join the Colorado River near Grand Junction. The highest area in the quadrangle is a ridge of Dakota Sandstone in the eastern half of sec. 9 of T. 50 N., R. 9 W. (elevation 6,143 feet), and the lowest point is in the Uncompahgre River valley bottom (elevation 5,277 feet) in the northwestern part of the quadrangle.