Core Research Center


Temporary Closure in Response to Coronavirus COVID-19 -- Valid for the week of January 25, 2021.

Following guidelines from the CDC and the Department of the Interior Office of Emergency Management, the USGS Core Research Center is temporarily closed to visitors as our employees transition to telework. We will work with you to reschedule your visit once we resume normal operations. Updates will be posted to this website.

Please contact us via email ( which will be monitored during normal business hours.  The CRC staff does not have access to office phones while teleworking and will not be able to respond to calls or voicemail messages.


The CRC's extensive rock core and cuttings collection is available for study by interested parties by appointment only. Contact us at CRC@USGS.GOV or (303) 202-4851 to schedule an appointment. Please review our FAQs for help in planning your visit.


Policy Updates and Reminders

Off-Site Use of CRC Core

In order to preserve the integrity of USGS Core Research Center cores, we will no longer be shipping cores off-site for workshops or displays. We will continue to allow local (Denver metro area) shipping for non-destructive analysis and core slabbing. We offer free workshop space and associated support services, and we encourage our stakeholders to take advantage of this by hosting workshops at the CRC. This new policy is intended to allow us to continue to provide you with the highest quality research and educational materials.

Privately-Owned Cores Brought to the CRC for Core Workshops

Workshops held at the CRC should primarily feature core from the CRC collection.  Non-USGS core may be brought in for comparison, but it must be less than 25% of the total amount of core used for the workshop.  The workshop sponsor assumes all responsibility for the privately-owned cores while at the CRC and in transit.

Amount of Material Allowed for Each Day of a CRC Appointment

The list of requested cores or cuttings must be submitted by noon on the business day prior to the appointment.  The list should be in priority order.  Before opening time on the scheduled day, the CRC staff will bring out as many of the requested wells as will fit in the allotted space.  No additional core or cuttings will be gotten out during the rest of that day.  If a visit is scheduled on consecutive days, the CRC staff will bring out a different set of wells for each day.  Please plan for the appropriate number of days.

Important Notice Regarding Real ID Act Requirements for Entry to Federal Facilities

As of December 18, 2019, all states and territories are either compliant with the Real ID act or have extensions until 2020. The extension dates vary, ranging from August to September, so please check your state.  Compliance status may affect TSA checkpoints or entry to Federal facilities including the Denver Federal Center - home of the CRC. PLEASE NOTE THAT EVEN IF YOUR STATE IS LISTED AS COMPLIANT, IF YOU HAVE AN OLDER LICENSE THAT DOES NOT MEET THE REAL ID ACT CRITERIA, YOU MAY HAVE DIFFICULTY ENTERING THE DENVER FEDERAL CENTER.  Full enforcement of REAL ID begins October 1, 2021, travelers without a compliant or enhanced ID (or other acceptable ID) will not be allowed to fly.  The Real ID Act was passed by Congress in 2005, based on recommendations from the 9/11 Commission. Please check the DHS website for the latest information on the compliance status of your state. If your ID was issued by a non-compliant or recently compliant state / territory, you might consider acquiring an alternative ID such as a U.S. Passport or U.S. Passport card. More information about the REAL ID Act of 2005, and Secure Driver’s Licenses can be found on this page from the Department of Homeland Security:
The CRC apologizes for any inconvenience to our visitors. 


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Publication Thumbnail
Year Published: 2009

Core Research Center

The Core Research Center (CRC) of the U.S. Geological Survey (USGS), located at the Denver Federal Center in Lakewood, Colo., currently houses rock core from more than 8,500 boreholes representing about 1.7 million feet of rock core from 35 States and cuttings from 54,000 boreholes representing 238 million feet of drilling in 28 States. Although...

Hicks, Joshua; Adrian, Betty
Core Research Center; 2009; GIP; 94; Hicks, Joshua; Adrian, Betty

Publication Thumbnail
Year Published: 2007

A condensed middle Cenomanian succession in the Dakota Sandstone (Upper Cretaceous), Sevilleta National Wildlife Refuge, Socorro County, New Mexico

The upper part of the Dakota Sandstone exposed on the Sevilleta National Wildlife Refuge, northern Socorro County, New Mexico, is a condensed, Upper Cretaceous, marine succession spanning the first five middle Cenomanian ammonite zones of the U.S. Western Interior. Farther north in New Mexico these five ammonite zones occur over a stratigraphic...

Hook, Stephen C.; Cobban, William A.