North America, according to James D. Dana, 1894, one of the greatest geologists of his time.  Note how Large some of the past "incursions" by the sea were.  The white areas denote the dry land, while the shaded gray areas, the sea.

Dana, J.D., Manual of Geology, 1894, p. 443

Dana, J.D., Manual of Geology, 1894, p. 536

Dana, J.D., Manual of Geology, 1894, p. 633