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- © L.Young, Aquarium of the Pacific.
Facts and Features
- Geographic Distribution
Ammonoid fossils are found around the world in a variety of marine sedimentary rocks that range in age from the Early Devonian (415 mya) to the Late Cretaceous (65 mya).
- Amazing Facts
Ammonoids are commonly used as index fossils. These are fossils found globally in great quantity and within a relatively limited time span, both of which make them helpful in dating rocks in widely separated areas. Knowing when particular species of ammonoid lived helps date rarer fossils of unknown age when they are found in the same rock formation as ammonoids.
- At the Aquarium
The fossil ammonites are no longer on display. To view ammonites visit the Los Angeles County Natural History Museum.
