The Cambrian Period had warmer global temperatures that were substantially warmer than today. In the present day, global temperatures average around 14–15 °C (57–59 °F). Global temperatures during Cambrian times, however, averaged about 22 °C (72 °F), which were typical for most of the Phanerozoic Eon. As the world entered the Ordovician Period, the interval that followed the Cambrian, global temperatures declined slightly, becoming comparable to those of today.
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