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GEOLOGICAL CHANGES
During the Cretaceous period the massive continents of Gondwanaland and Laurasia continued to separate. South America and Africa had separated, with the consequent widening of the South Atlantic. The North Atlantic continued to expand, although it appears that Europe, Greenland, and North America were still connected moving northwestward. Madagascar had separated from Africa, while India was still drifting northward toward Asia. The Tethys Sea was disappearing as Africa moved north toward Eurasia. Antarctica and Australia had yet to separate.
At the beginning of the Cretaceous in North America, the Mexican Sea of the late Jurassic period spread over Texas, Oklahoma, New Mexico, and parts of Arizona, Kansas, and Colorado. During later Cretaceous period the Colorado Sea became the greatest of the North American Mesozoic seas and extended all the way from Mexico up into the Arctic, covering most of central North America. Near the end of the Cretaceous the......

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