| http://www.w3.org/ns/prov#value | - At that time there was a sudden explosion of many diverse marine species, including the first appearance of molluscs, arthropods, echinoderms and vertebrates. ???Sudden??? here is used in the geological sense; the ???explosion??? occurred over a period of 10m to 30m years, which is, after all, comparable to the time taken to evolve most of the great radiations of mammals.
|
