This 30×60 minute map, provided as a digital GIS dataset, is a 2022 compilation of the original 1989 USGS (Geologic map and cross sections of parts of the Grand Junction and Delta 30′ x 60′ quadrangles, west-central Colorado) updated with other more contemporary data sources. This particular compilation includes separate surficial and bedrock geodatabase sets. This mapping project was funded jointly by the CGS and the United States Geological Survey through the National Cooperative Geologic Mapping Program. Further details on the compilation process and provenance are available in the various metadata forms found in the package. This series of 30×60 minute maps are comprised of a download package of GIS data only: there are no map plates or reports. Digital ZIP download. OF-22-13D
From the map metadata:
The Colorado School of Mines is pleased to present the Colorado Geological Survey’s “OF-22-13D Digital Compilation of Surficial and Bedrock Geology of the Delta 30×60 Minute Quadrangle, Delta, Mesa, and Montrose Counties, Colorado (Data)”. Its purpose is to describe the surficial and bedrock geologic setting of this 30×60 minute map. The original data sources are listed in the DataSources table and shown in the DataSourcePolys feature class. For this study, the surficial units were separated from the bedrock units. Where there were no original GIS files, the maps were scanned and georeferenced. Digital Data Services digitized the map units, contacts, faults, and relative fault movement. The data was then imported into a GeMS style geodatabase. Topology was applied using the GeMS topology rules and then the gdb was validated using the GeMS validation script. The map was validated to Level 3.