The Ordovician period follows the extinction at the end of which period?

The Ordovician is a geologic period and system, the second of six of the Paleozoic era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago. It follows the Cambrian period and is followed by the Silurian period.

The Ordovician follows the Cambrian Period