Research topic: Cretaceous period

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Cretaceous period

The Columbia Encyclopedia, Sixth Edition
Cretaceous period , third and last period of the Mesozoic era of geologic time (see Geologic Timescale , table), lasting from approximately 144 to 65 million years ago. The Cretaceous was marked, in both North America and Europe, by extensive submergences of the continents. Changes both in the earth's surface and in its flora and fauna brought the Mesozoic to a close. Historical Geology of the Period The Lower Cretaceous Period At the beginning of the Lower Cretaceous in North America, the Mexican Sea of the late Jurassic period spread over Texas, Oklahoma, New Mexico, and... Read more
Cretaceous Period
Cretaceous Period The Cretaceous period is the third of the three divisions of the Mesozoic era of...supercontinent Pangea, continued to separate from each other during the Cretaceous period. These landmasses also began to fragment within themselves... Read more
Cretaceous Period
...throughout the Cretaceous, while the reptiles continued their dominance. The dinosaur s reached the peak of their evolution during this period but rather suddenly became extinct at its end. Cretaceous Period Cretaceous Period Cretaceous Period Read more

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