The Ordovician period is the second period in the [[Paleozoic]] era. It started approximately 500 million years ago after the end of the [[Cambrian]]. Most of the phyla which are living today existed at the beginning of the Ordovician period. By the end of the Ordovician period, the first land plants, bryophytes, evolved and began to colonize the land. The Ordovician also saw the [[evolution]] of [[fish]]. The Ordovician was preceded by the [[Cambrian]] and succeeded by the [[Silurian]]. | The Ordovician period is the second period in the [[Paleozoic]] era. It started approximately 500 million years ago after the end of the [[Cambrian]]. Most of the phyla which are living today existed at the beginning of the Ordovician period. By the end of the Ordovician period, the first land plants, bryophytes, evolved and began to colonize the land. The Ordovician also saw the [[evolution]] of [[fish]]. The Ordovician was preceded by the [[Cambrian]] and succeeded by the [[Silurian]]. |