Approximately 521 - 252 Million Years Old
The name Trilobite means three lobed and refers to the main axial lobe which is flanked by side-ribs on the left and right, not the head, thorax, and tail that one might assume. They were one of the most common creatures of the Paleozoic era and went extinct before dinosaurs ever appeared. Their exoskeletons lent themselves easily to fossilization due to the high calcite content. Each family has distinct variations- so you can pick out one or a few that match your fossil style.
Flexicalymene is a type of trilobite that lived way back during the Ordovician period, around 449 to 443 million years ago. You can find fossils of this species across North America, Europe, and North Africa. Fun fact—these guys were once formally known as Diacalymene.
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