Colorado is home to several world-class molybdenum deposits including the alkaline felsic intrusive deposits of the Climax Mine—once the largest moly mine in the world—in Lake County, Colorado, July 2010. Photo credit: Vince Matthews for the CGS.

>RockTalk<

Welcome to the >RockTalk< blog where we bring you the best of Colorado geoscience :: whenever rocks talk, we listen! To stay up-to-date while enjoying interesting geoscience content, subscribe to >RockTalk<! We’ll be bringing you announcements of our newest publications and projects, along with items from our expansive archive and other geoscience news of note. [FYI: This subscription is separate from your store login!]

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Tree trunk with up-stream face scoured by debris flow, Paradise Acres, Huerfano County, Colorado, September 2018. Photo credit: Jon Lovekin for the CGS.

Hazards

June 23, 2021

HAZ-2021-01 Post-wildfire Hazards

Noting that we were getting hundreds of search hits on a previous version of an info-brochure that we originally published…

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…

Looking northwest to Hells Kitchen from Ekkert, Colorado, towards Grand Mesa across the wide range of environments from

Geology

April 26, 2021

Recent STATEMAP quadrangles

The CGS actively participates in the STATEMAP portion of…

Surface operations at the Climax molybdenum mine, Lake County, Colorado, 2009. Photo credit: Vince Matthews for the CGS.

Geology

April 15, 2021

A few new publications

For those of you who are recent subscribers to the CGS mailing list, we wanted to direct your attention to…

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…

Mining town, Eureka, San Juan County, Colorado, circa 1900. Photo credit: William Henry Jackson.

Geology

November 24, 2020

Re-introducing: Historic Metal Mining Districts

As the reconstruction of our website continues, we recently redeployed a popular package of information that was compiled and made…

While Glendon Rewerts begins the excavation that will host the site, Kyren Bogolub documents the installation gear: the Guralp CMG-3T seismometer in front, and the solar-powered Reftek RT130 digitizer in a Hardigg case with a Suntek solar panel behind. Photo credit: Ebru Bozdag.

Hazards

October 13, 2020

Seismometer installed on campus

Mines students partner with the CGS to install seismometer on campus Colorado School of Mines geophysics students enrolled…

The classic afternoon thunderstorm forming over South Park can make field work ... complicated! Antero Reservoir Northeast quadrangle, South Park, Colorado, July 2017. Photo credit: Peter Barkmann for the CGS.

Geology

September 9, 2020

Recent STATEMAP quadrangles

The CGS actively participates in the STATEMAP portion of…

Colorado is well-known for the violence of summer afternoon thunderstorms that can be extremely dangerous, especially when at high-altitude. Photo credit: David Noe for the CGS.

Geology

July 22, 2020

Field Safety

It's field mapping time, and much of our staff are out in several different areas of the state, doing field work. A majority of the field work is part of the STATEMAP program—preparing geologic maps of particular quadrangles for the US Geological Survey sponsors of that nation-wide program.

Looking up the avalanche chute along Henson Creek in Hinsdale County, Colorado, April 2019. Photo credit: Jon Lovekin for the CGS.

Hazards

July 14, 2020

Colorado Scientific Society lecture online

TITLE: Historic Avalanches in Hinsdale County, Colorado: Impacts to Lake City, old mining dams, and new evidence for the association…

Water

June 7, 2020

New Colorado Groundwater Atlas released

ON-010 Colorado Groundwater Atlas

OF-19-03 Geologic Map of the La Salle Quadrangle, Weld County, Colorado (detail)

Geology

April 24, 2020

OF-19-03 Geologic Map of the La Salle Quadrangle, Weld County, Colorado

As we continue to expand geological mapping coverage of Colorado, we recently uploaded another of our…

The end result of the current trenching on the Cheraw fault, near Arlington, Colorado, April 2019. Photo credit: Matt Morgan for the CGS.

Hazards

March 20, 2020

Trenching the Cheraw Fault in Southeastern Colorado

One of the missions of the CGS is to better understand the various geological risks that face the residents of…

A uranium-rich zone in a sandstone of the Morrison Formation, Carnation Mine, San Miguel County, Colorado, January 2007. Photo credit: Colorado Geological Survey.

Energy

February 18, 2020

Colorado’s Uranium Deposits

[Ed: this document, written in 2011 by Jim Burnell, Ph.D., P.G. (former Senior Minerals Geologist, Colorado Geological Survey), provides an…

Slice of a pallasite meteorite, illustrating large olivine (peridot) crystals in a matrix of nickel-iron minerals. This specimen, known as the Brenham meteorite (DMNH EGT.23.0), is from Haviland, Kansas, and is ~25 cm wide. Photo credit: R. Wicker for the Denver Museum of Nature and Science.

Geology

February 10, 2020

DMNS Meteorite Collection

The Meteorite Collection of the Denver Museum of Nature & Science publication

Mount Garfield from Interstate-70, Mesa County, Colorado, March 2016. Photo credit: Larry Scott for the CGS.

General

January 10, 2020

Welcome to the final CGS/RockTalk web iteration

If you want to find out what's happening with the new CGS site, read here! Apologies for the incompleteness, it will improve on a daily basis, we promise!