National Geochronological Data Base
Entry ID: NGDB

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Abstract: The National Geochronological Data Base (NGDB) was established by the United States Geological Survey (USGS) to collect and organize isotopic (also known as radiometric) ages of rocks in the United States. For each dated rock sample reported in published literature, a record containing information on sample location, rock description, analytical data, age, interpretation, and literature ... View entire text
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Description: National Geochronological Database
Geographic Coverage
Spatial coordinates   
  N: 72.0   S: 24.0   E: -66.0   W: -179.0

Data Set Citation
Dataset Originator/Creator: U.S. Geological Survey
Dataset Title: National Geochronological and Natural Radioelement Data Bases
Dataset Release Date: 1996
Dataset Release Place: Sioux Falls, South Dakota, USA
Dataset Publisher: U.S. Geological Survey
Online Resource:
Temporal Coverage
Start Date: 1975-01-01
Access Constraints None
Use Constraints There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to for the USGS disclaimer.
Data Set Progress
Originating Center
Data Center
Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior Supplemental Info
Data Center URL:
Dataset ID: NGDB

Data Center Personnel
Phone: 605-594-6151, 800-252-4547
Fax: 605-594-6589
Email: lta at
Contact Address:
LTA Customer Services
U.S. Geological Survey
EROS Center
47914 252nd Street
City: Sioux Falls
Province or State: SD
Postal Code: 57198-0001
Country: USA
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Distribution Media: Digital Download from
Fees: None
Phone: 303-236-4723
Fax: 303-236-4930
Email: cbush at
Contact Address:
U.S. Geological Survey
National Cooperative Geologic Mapping
MS 963, Building 21B
Federal Center
City: Denver
Province or State: CO
Postal Code: 80225
Country: USA
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Zartman, R.E., Bush, C.A., and Abston, Carl, 1995, National
Geochronological and Natural Radioelement Data Bases, [data base] A, National Geochronological Data Base [and data base] B, Natural Radioelement Data Base, U.S. Geological Survey Digital Data Series DDS-14. [Published on CD-ROM.]

Bates, R.L., and Jackson, J.A., eds., 1980, Glossary of geology (2d
ed.): Falls Church, Va., American Geological Institute, 749 p.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2005-12-06
Last DIF Revision Date: 2015-02-10
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