reverse search

Comprehensive
Dictionary Suite
Help
Help
Help
 
Cambrian the Cambrian Period, or the rock formations that date from that time. [1/2 definitions]
Ordovician of, relating to, or designating the geological period between the Cambrian and Silurian of the Paleozoic Era, from approximately 500 million to 440 million years ago, when marine invertebrate animals were abundant. [1/2 definitions]