Twenty-five rock samples dredged from ten submarine canyons off the Atlantic coast of the United States have yielded [more than 50 species of] ostracodes that are interpreted to be of Pleistocene age. The taxonomiccomposition of the assemblages [in comparison with modern faunas] suggests that during times of lowered sea level the present boundary between cold- and mild-temperate faunal provinces, about 42 degrees north latitude, lay approximately 500 miles southwest, near 38 degrees north latitude.

You do not currently have access to this article.