To link to this resource use: https://libraries.indiana.edu/resources/geolex
Information on geologic units in the United States including their names, age, extent, and publications that describe each unit.
Coverage: 1836 - Present - Updated Regularly
Vendor: U.S. Geological Survey
Producer: U.S. Geological Survey
Interlibrary Loan Type: Not Permitted
Simultaneous User Limit: Unlimited simultaneous users