Recent stratigraphic studies have permitted the making of some new guesses about land and sea distribution and the changes that occurred from time to time between the end of the Cretaceous and the beginning of the Oligocene. The chief conclusions are: (1) that some large areas in the Coast Ranges were notably folded near the end of the Cretaceous; (2) that the tectonic provinces that existed throughout the Tertiary were defined by the post-Cretaceous folding; and (3) that upper Middle Eocene was the time of maximum transgression in the folded areas during the Lower Tertiary.

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