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When did trilobites make their last appearance in the fossil record?
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Permian Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins near the end of the Permian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
Trilobites made their final appearance in the fossil record during the Permian Period, which spanned from approximately 298.9 million to 251.9 million years ago. By this time, the group was long past its peak abundance, and they ultimately went extinct at the end of the Permian alongside many other marine invertebrate species during the Permian-Triassic mass extinction event.12