Research Article: Cretaceous Period

The Cretaceous period is the third of the three divisions of the Mesozoic era of the geologic time scale. The period lasted 79 million years, from 144 million to 65 million years ago. The Cretaceous is named for chalk beds found in England.

Cretaceous and surrounding time periods.

Laurasia and Gondwanaland, the northern and southern landmasses that resulted from the initial breakup of the supercontinent Pangea, continued to separate from each other during the Cretaceous period. These landmasses also began to fragment within themselves to form our modern continents. Throughout most of the Cretaceous, North America was divided by a vast inland sea that extended from the Gulf of Mexico to Canada.

Early in the...
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