Underwritten with special supplemental funding though the US Geological Survey (USGS) STATEMAP Program, we digitized, re-compiled, and quality-controlled several previously-published 30×60-minute geologic map quadrangles as GIS data packages. In addition to the information the original 1:100,000-scale maps, data from more recent 1:24,000-scale (7.5 minute) CGS quadrangle mapping was merged into the final datasets. Four of the packages are surficial geology only; the others contain separate surficial and bedrock geology packages. These GIS-data-only publications were produced to the GeMS Level 3 metadata standards as mandated by the USGS. The GeMS schema for (geologic) GIS data is being developed by the USGS to support a single seamless nation-wide geological data standard. It is a primary component of the National Geologic Map Database (NGMDB).
These publications will aid in establishing regional trends across geologically complex areas of the state. Metadata included in each package provides provenance and other background information and is accessible through whichever GIS platform you may be using.
Along the Grand Hogback. Photo credit: Vince Matthews for the CGS.The erosional towers on Blue Mesa Reservoir are carved in the West Elk Breccia which is exposed in numerous places around Gunnison on Highway 50. These breccias are a feature of a large stratovolcano whose vent is about 15 miles north of the reservoir in the West Elk Mountains. Photo credit: Vince Matthews for the CGS.A cuesta along Dirty George Creek capped by Cozzette Sandstone that interfingers the Mancos Shale. The thick whitish colored sandstone in center background above the Mancos is the Rollins Sandstone of the Iles Formation. The reddish rock above is coal-fire clinker in the Williams Fork Cameo coal zone, south of Hells Kitchen, Delta County, Colorado. Photo credit: Jon White for the CGS.
The original USGS map publications are listed under the citations tab below. There are more than 50 (30×60-minute) 1:100,000 scale map quadrangles covering Colorado of which 14 exist as separate geologic maps. These may be downloaded directly from the NGMDB catalog or mapview.
Citations, Categories & Tags
Citations
Original USGS Maps
Ellis, Margaret S., and Virginia Gabaldo. “Geologic Map and Cross Sections of Parts of the Grand Junction and Delta 30’ x 60’ Quadrangles, West-Central Colorado.” Map, 1:100,000. Coal Investigations. Washington, D.C.: U.S. Geological Survey, 1989. USGS Publications Warehouse. https://doi.org/10.3133/coal124.
Madole, R.F. “Surficial Geologic Map of the Steamboat Springs 30’ x 60’ Quadrangle, Grand, Jackson, and Routt Counties, Colorado.” Report. IMAP. Washington, D.C.: U.S. Geological Survey, 1991. USGS Publications Warehouse. https://doi.org/10.3133/i1825.
———. “Surficial Geologic Map of the Walden 30’ x 60’ Quadrangle, Jackson, Larimer, and Routt Counties, Colorado.” Report. IMAP. Washington, D.C.: U.S. Geological survey, 1991. USGS Publications Warehouse. https://doi.org/10.3133/i1824.
Madole, Richard F. “Surficial Geologic Map of the Craig 1/2 Degree x 1 Degrees Quadrangle, Moffat and Routt Counties, Colorado.” Surficial Geology, 1:100,000. Miscellaneous Investigations. Washington, D.C.: U.S. Geological Survey, 1982. https://ngmdb.usgs.gov/Prodesc/proddesc_9156.htm.
———. “Surficial Geologic Map of the Meeker 30’ x 60’ Quadrangle, Garfield, Moffat, Rio Blanco and Routt Counties, Colorado.” Report, 1:100,000. IMAP. Washington D.C.: U.S. Geological Survey, 1989. USGS Publications Warehouse. https://doi.org/10.3133/i1823.
Steven, T. A., and W. J. Hail Jr. “Geologic Map of the Montrose 30’ x 60’ Quadrangle, Southwestern Colorado.” Report. IMAP. Washington D.C.: U.S. Geological Survey, 1989. USGS Publications Warehouse. https://doi.org/10.3133/i1939.
New CGS GIS Datasets Maps
Sebol, Lesley A., and Kassandra O. Lindsey. “OF-22-14D Digital Compilation of Surficial and Bedrock Geology of the Grand Junction 30x60 Minute Quadrangle, Delta, Garfield and Mesa Counties, Colorado (Data).” Geologic, Digital (variable). Open File Report. Golden, CO: Colorado Geological Survey, August 2023. Https://doi.org/10.58783/cgs.of2214.agzj7810. CGS Publications. https://coloradogeologicalsurvey.org/publications/geology-grand-junction-quadrangle-delta-garfield-mesa-colorado-data/.
Broes, Lauren D. “OF-22-13D Digital Compilation of Surficial and Bedrock Geology of the Delta 30x60 Minute Quadrangle, Delta, Mesa, and Montrose Counties, Colorado (Data).” Geologic, Digital. Open File Report. Golden, CO: Colorado Geological Survey, December 2022. Https://doi.org/10.58783/cgs.of2213.wuui5711. CGS Publications. https://coloradogeologicalsurvey.org/publications/geology-delta-quadrangle-mesa-montrose-colorado-data/.
