Discovering Fossils: What is an Echinoid?



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Details of Discovering Fossils: What is an Echinoid?

About Discovering Fossils: What is an Echinoid?
Discovering Fossils: What is an Echinoid?- Provides photographs and information on echinoids, or sea urchins, the arrival of regular species in the fossil record in the Cambrian and the appearance of irregular ones in the Jurassic.