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Paleozoic and Mesozoic Seas

During the Paleozoic and Mesozoic, six marine transgressions and regressions caused sea level to rise over the continents, leaving evidence in rocks in the Grand Canyon and elsewhere.

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Transgression and Regression

Transgression and Regression 

Describes the transgression and regression movement of the seas during the Paleozoic and Mesozoic time periods (4:18). 

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