Ordovician

Saturday, October 20, 2012

Ordovician is the second period of the Paleozoic era. Preceded by the Cambrian and succeeded by the Silurian, the Ordovician began around 500 million and finished 440 million years ago. It is characterized by the abundance of marine and plant lives, such as conodonts, ostracods, algae, and seaweeds.