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• Image Gallery
Bryozoans and Graptolites
Though bryozoans and graptolites each belong to their own group, they have something in common. In both, each animal is a colony made up of many tiny individuals, each protected by a hard, tube-like skeleton.
Unlike every other group displayed here, neither bryozoans nor graptolites can be traced back to the “explosion” of life that happened early in the Cambrian Period. But fossils tell us that during the Ordovician, both were all over the world.
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