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The Karl Hirsch Fossil Eggshell Collection contains over 3,000 cataloged specimens. Most of the collection was collected from the Rocky Mountain Region, with extensive collections of Jurassic (Morrison Formation), Cretaceous (Cedar Mountain, Judith River, Kaiparowits, North Horn, St. Mary River, and Two Medicine Formations), Eocene (Bridger, DeBeque, Wasatch, Willwood, and Wind River Formations), and Oligocene (White River Formation) specimens.

All the Karl Hirsch Fossil Eggshell Collection records are available online through Arctos. Access to the database as well as information on data use licenses and polices and how to use Arctos can be found on the databases page.

Learn more about the Karl Hirsch Fossil Eggshell Collection by visiting this online special exhibit from the . Here you can learn more about the methods used to study fossil eggshells, how fossil eggshells are classified, the fossil record of fossil eggshells, what fossil eggshells can tell us about the paleobiology of extinct animals, and much more.