Saturday, August 18, 2012

The Cretaceous is one of the three periods into which the Mesozoic era is divided; the other two being the Triassic and Jurassic. The Cretaceous is characterized by the extinction of giant reptiles, advent of modern insects, and flowering plants. This period is usually subdivided into an Upper and Lower Cretaceous and comprises a time span between 135 and 70 million years ago. See Time Spans of Earth History