Trilobites, such as this Mummaspis muralensis, emerged during the Cambrian Period and went extinct more than 250 million years ago. About 513 million years ago, a creature curled up like a pill bug to ...
LOCUST GROVE, Ohio — During a recent day of digging along stream banks, Tom Johnson turned up dozens of trilobite pieces. He squatted for hours, quarrying layers of limestone and shale that had formed ...
Over 300 million years, trilobites evolved a diverse and successful array of forms while maintaining a simple, common body plan. Related Article Three vertical lobes BODY PLAN Trilobites had three ...
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