Wisconsin State Fossil

Wisconsin designated the trilobite (Calymene celebra) as official state fossil in 1985. Related to modern day crabs, lobsters, shrimp, spiders, and insects, this extinct marine arthropod flourished in shallow prehistoric salt waters during the early to middle Paleozoic age. An exceptionally well-preserved trilobite with antennæ and legs - photo by Smith609 on Wikipedia - published under terms of the GNU Free Documentation license version 1.2 or later Like modern arthropods, they had to periodically molt their shells to grow, so one trilobite could have left a dozen or more shed carapaces to fossilize.

Source:	Wisconsin State Symbols: Wisconsin.gov
Links:	State Fossils & Dinosaurs - 50 States

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