The purpose of the Colorado Geological Survey Open File Report 08-17, Geologic Map of the Larkspur Quadrangle, Douglas and El Paso Counties, Colorado is to describe the geologic setting and mineral resource potential of this 7.5-minute quadrangle located in the Front Range, Between Colorado Springs and Castle Rock, Colorado. Consulting geologist Jon P. Thorson completed the field work on the eastern half of the quadrangle during the summer of 2004. Consulting geologists Jay Temple and Alan Busacca completed the field work on the western half of the quadrangle during the summer of 2007. Hydrogeologist William Berg has been a consultant for a major landowner in the western half of the quadrangle since 2005 and added considerable detail to the groundwater resource section of the report. Digital ZIP/PDF download. OF-08-17D
From the authors notes:
The Larkspur 7.5-minute quadrangle is located southwest of Castle Rock, Colorado, in the southern part of the Colorado Piedmont section of the Great Plains. The quadrangle is located near the head of the Plum Creek drainage, which is tributary to the South Platte River. Geologic mapping of the Larkspur quadrangle was undertaken by the Colorado Geological Survey (CGS) as part of the STATEMAP component of the National
Cooperative Geologic Mapping Program. Geologic maps produced by the CGS through the STATEMAP program are intended as multi-purpose maps useful for land-use planning, geotechnical engineering, geologic hazards assessment, mineral resource development, and ground-water evaluation.