Hopkins, of the Colorado Geological Survey, reported April 26, 2021 on the release of new Colorado geological maps. The CGS actively participates in the STATEMAP portion of the U.S. Geological Survey’s National Cooperative Geologic Mapping Program (NCGMP), a nation-wide effort to generate comprehensive geologic maps of individual 7-1/2-minute topographic quads. Following one or sometimes two seasons of intensive field work by a team of researchers, field information is carefully compiled, reviewed, and released as one of our geologic quadrangle maps. These are in the form of high-resolution PDF files along with a corresponding package of GIS data.
- OF-20-03 Geologic Map of the Bracewell Quadrangle, Weld County, Colorado — between Greeley and Windsor, Colorado, including the western-most suburbs of Greeley, along the Cache la Poudre River.
- OF-19-05 Geologic Map of the Hells Kitchen Quadrangle, Delta and Mesa Counties, Colorado — on the southern flank of Grand Mesa, west of the town of Cedaredge.
- OF-20-05 Geologic Map of the Greeley Quadrangle, Weld County, Colorado — encompassing most of the town of Greeley, Colorado along with areas to the west and north.
The Geologic Mapping Advisory Committee (GMAC)—with representatives from State, Federal, and Tribal governments, academia, and the private sector—select which Colorado quadrangles are included in this ongoing program. Our STATEMAP progression map shows the many quads that have been completed, are in progress, or under current consideration across the state. The program provides crucial information to many constituents on geologic hazards, mineral resources, and groundwater, as well as informing a range of land-use issues across the state.
And, for those of you who are recent subscribers to the CGS mailing list, we wanted to direct your attention to a handful of new publications that we haven’t otherwise publicized. We’ve been adding more in the last months, so stay tuned for another introductory posting:
- IS-82 Colorado Mineral and Energy Industry Activities 2018-2019 — Our annual overview of Colorado’s mineral resource activities. The 2019-2020 review will be out shortly.
- MI-98 Catastrophic Glacial Outburst Floods on the Upper Arkansas River, Colorado — The history of three ancient catastrophic floods that raged down the Upper Arkansas River Valley during the glacial past of the Central Rockies.
- MI-100 Summary Report on the McQueary Gulch Trench, Williams Fork Mountains Fault, Grand County, Colorado — Trenching is a technique for determining the historical activity on a known fault — in this case, a fault north of Silverthorne.
- OF-19-13 Storm Floods on Trout Creek, Chaffee County, Colorado — Another fascinating exploration of the influence of flooding in the evolution of the Colorado landscape, by Colorado School of Mines Emeritus Professor of Geology, Dr. Keenan Lee.
- OF-19-06 Landslide Inventory and Susceptibility Map of Boulder County, Colorado — The CGS provides geologic hazard susceptibility maps to state and local governments for use in planning processes and mitigation plans. This map is part of a statewide effort to develop inventory and susceptibility maps for landslide-prone areas in Colorado.
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