RN-05 Reconnaissance of Critical Minerals in Denver Formation Coal-Bearing Strata, Denver Basin, Ramah-Fondis Coal Field, Colorado 01/21/2026 RN-05 Reconnaissance of Critical Minerals in Denver Formation Coal-Bearing Strata, Denver Basin, Ramah-Fondis Coal Field, Colorado *PUBLICATION DISCLAIMER* Research Notes (RN) publications are intended to provide members of the geoscience community with an avenue for publishing independent research and for supporting scientific exchange and the preservation of observations and interpretations. These publications have not been subject to the typical Colorado Geological Survey review process, but submissions… Read More
OF-25-06 Baseline Radiological Study Year 4: Lower Arkansas River Area, Colorado 01/15/2026 OF-25-06 Baseline Radiological Study Year 4: Lower Arkansas River Area, Colorado The Colorado Geological Survey (CGS), a department of the Colorado School of Mines, has been funded through a grant from the Colorado Department of Public Health & Environment (CDPHE) to conduct a 5‐year study of baseline naturally occurring radionuclides and metals in groundwater obtained from privately owned residential water wells… Read More
OF-24-03 Geologic Map of the Severance Quadrangle, Weld County, Colorado 01/08/2026 OF-24-03 Geologic Map of the Severance Quadrangle, Weld County, Colorado The purpose of this publication is to describe the geology, mineral and groundwater resources, and geologic hazards of the Severance 7.5-minute quadrangle. It is a continuation of field mapping work in the northern Colorado Piedmont where the CGS has mapped multiple quadrangles, this one covering the area around the town… Read More
OF-24-02 Geologic Map of the Timnath Quadrangle, Larimer and Weld Counties, Colorado 01/08/2026 OF-24-02 Geologic Map of the Timnath Quadrangle, Larimer and Weld Counties, Colorado The purpose of this publication is to describe the geology, mineral and groundwater resources, and geologic hazards of the Timnath 7.5-minute quadrangle. It is a continuation of field mapping work in the northern Front Range and Colorado Piedmont areas where the CGS has mapped multiple quadrangles, this one covering the… Read More
OF-24-01 Geologic Map of the Fort Collins Quadrangle, Larimer County, Colorado 01/08/2026 OF-24-01 Geologic Map of the Fort Collins Quadrangle, Larimer County, Colorado The purpose of this publication is to describe the geology, mineral and groundwater resources, and geologic hazards of the Fort Collins 7.5-minute quadrangle. It is a continuation of field mapping work in the northern Front Range and Colorado Piedmont areas where the CGS has mapped multiple quadrangles, this one covering… Read More
OF-24-06 Geologic Map of the Highline Lake Quadrangle, Mesa and Garfield Counties, Colorado 01/06/2026 OF-24-06 Geologic Map of the Highline Lake Quadrangle, Mesa and Garfield Counties, Colorado The purpose of this publication is to describe the geology, mineral and groundwater resources, and geologic hazards of the Highline Lake 7.5-minute quadrangle. This map is part of a STATEMAP geologic mapping program on Colorado’s Western Slope, near Grand Junction. Nearby completed CGS maps are the Badger Wash,… Read More
ON-006-26M Alluvial Fan Mapping of Summit County, Colorado (Map) 01/05/2026 ON-006-26M Alluvial Fan Mapping of Summit County, Colorado (Map) The Colorado Geological Survey develops and provides a variety of geologic hazard maps for various state and local governments with land use and hazard mitigation planning in mind. To prepare for post-wildfire natural hazards, the CGS has mapped alluvial fans as well as high-angle fans and (or)… Read More
ON-006-26D Alluvial Fan Mapping of Summit County, Colorado (Data) - v20251121 01/05/2026 ON-006-26D Alluvial Fan Mapping of Summit County, Colorado (Data) – v20251121 The Colorado Geological Survey develops and provides a variety of geologic hazard maps for various state and local governments with land use and hazard mitigation planning in mind. To prepare for post-wildfire natural hazards, the CGS has mapped alluvial fans as well as high-angle fans and (or)… Read More
ON-006-24M Alluvial Fan Mapping of Lake County, Colorado (Map) 01/05/2026 ON-006-24M Alluvial Fan Mapping of Lake County, Colorado (Map) The Colorado Geological Survey develops and provides a variety of geologic hazard maps for various state and local governments with land use and hazard mitigation planning in mind. To prepare for post-wildfire natural hazards, the CGS has mapped alluvial fans as well as high-angle fans and (or)… Read More
ON-006-24D Alluvial Fan Mapping of Lake County, Colorado (Data) - v20251201 01/05/2026 ON-006-24D Alluvial Fan Mapping of Lake County, Colorado (Data) – v20251201 The Colorado Geological Survey develops and provides a variety of geologic hazard maps for various state and local governments with land use and hazard mitigation planning in mind. To prepare for post-wildfire natural hazards, the CGS has mapped alluvial fans as well as high-angle fans and (or)… Read More
ON-006-22M Alluvial Fan Mapping of Gilpin County, Colorado (Map) 01/05/2026 ON-006-22M Alluvial Fan Mapping of Gilpin County, Colorado (Map) The Colorado Geological Survey develops and provides a variety of geologic hazard maps for various state and local governments with land use and hazard mitigation planning in mind. To prepare for post-wildfire natural hazards, the CGS has mapped alluvial fans as well as high-angle fans and (or)… Read More
ON-006-22D Alluvial Fan Mapping of Gilpin County, Colorado (Data) - v20251120 01/05/2026 ON-006-22D Alluvial Fan Mapping of Gilpin County, Colorado (Data) – v20251120 The Colorado Geological Survey develops and provides a variety of geologic hazard maps for various state and local governments with land use and hazard mitigation planning in mind. To prepare for post-wildfire natural hazards, the CGS has mapped alluvial fans as well as high-angle fans and (or)… Read More