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Over 500 maps are available for download in the CGS bookstore. A download is an online digital file that can be transferred to another computer system.

OF-22-16D Digital Compilation of Surficial and Bedrock Geology of the Montrose 30x60 Minute Quadrangle, Gunnison, Hinsdale, Montrose, Ouray, and San Miguel Counties, Colorado (detail)

Geology

March 30, 2023

New Colorado 30×60 minute quadrangle datasets

Underwritten with special supplemental funding though the US Geological Survey (USGS) STATEMAP Program, we digitized, re-compiled, and quality-controlled several…

Pyrite, a metallic sulfide mineral, found in the dump of the Allan Emory Mine in Summit County, Colorado. Photo credit: Colorado Geological Survey.

Hazards

July 21, 2022

Case Study: NARD

Are pristine mountain waters always clean and pure? Can streams unaffected by human activities and livestock influences be unfit…

North Table Mountain stands between Golden and the wider Denver metro area in the background. Photo credit: Vince Matthews for the CGS.

Geology

May 10, 2022

Golden Rocks: The Geology and Mining History of Golden, Colorado

We’ve received the go ahead to help distribute this marvelous (and FREE!) 100+ page digital publication from the talented…

The Flatirons overlooking Boulder, Colorado are comprised of once flat-lying Permian Fountain Formation sedimentary rock that were tilted to 50 degrees by the orogenic uplift of the Rocky Mountains. Photo credit: Vince Matthews for the CGS.

Geology

April 21, 2022

Unfolding the Geology of the West

Our collaborators and friends up in Boulder at the Geological Society of America (GSA) are making…

Detail from one of over 600 Denver Basin geophysical and lithological logs included in the ON-OF-78-08M digitization project. Photo credit: Colorado Geological Survey.

Geology

June 3, 2021

New GIS data and maps

For those of you who are subscribers to the CGS announcement list, we want to direct your attention to a…

Avalanche snow with disturbed vegetation in runout zone. Photo credit: Colorado Geological Survey.

Hazards

February 8, 2021

The Snowy Torrents

Here in Colorado, avalanche season is not over yet, and it’s been another deadly one with 26 fatalities so far…

The Arikaree River at Beecher Island in Yuma County, Colorado, February 2017. The groundwater level is indicated by the pooling of water in the bed of the otherwise dry river channel. Water will fill low spots in the channel that are deep enough to reach the water table. Photo credit: Jeffrey Beall, Wikimedia Commons https://commons.wikimedia.org/.

Water

June 7, 2020

New Colorado Groundwater Atlas released

ON-010 Colorado Groundwater Atlas

Piping cave/soil arch in Qamf deposit, Loutzenhizer Arroyo, Delta County, Colorado, April 2007. Photo credit: David Noe for the CGS.

Hazards

July 12, 2018

Collapsible Soils

By Jonathan White, Senior Engineering Geologist, Emeritus At the end of the 19th and beginning of…

MI-97 LiDAR-Based Map of the Cheraw Fault Scarp. Graphic credit: Colorado Geological Survey

Hazards

September 12, 2017

AEG Annual Meeting

Members of our geoscience staff are busy this week participating in the Annual Meeting of the…

OF-16-05 Geologic Map of the Longmont Quadrangle, Boulder and Weld Counties, Colorado (detail, Plate 1).

Geology

April 12, 2017

OF-16-05 Geologic Map of the Longmont Quadrangle, Boulder and Weld Counties, Colorado

We just uploaded the most recent of our STATEMAP mapping products to…

Boulder oil field, 1915. Photo credit: C. L. McClure and the Denver Public Library.

General

March 28, 1907

Concerns about the new survey

Regarding the Colorado Geological Survey (an article appearing in the Mining Reporter, March 1907): We note that one of our…