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Ordovician

The Ordovician /?rd?'v???n/ is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 to 443.4 ± 1.5 million years ago (ICS, 2004). It follows th ...

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Devonian

The Devonian is a geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period, about 419.2 ± 3.2 Mya (million years ago), to the beginning of the Carboniferous Period, ...

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Trilobite

Trilobites (/'tra?l?ba?t/, /'tr?l?ba?t/; meaning "three lobes") are a well-known fossil group of extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest ...