DISTRIBUTION

 

Chitinozoa appeared during the Cambrian, diversified rapidly in the Ordivician and Silurian, and became extinct toward the end of the Devonian Period.  They lived 510-360 million years ago.

 

PERIOD DATES (Ma)
Devonian 360-408
Silurian 408-438
Ordovician 438-505
Cambrian 505-570

 

 

Back     Next