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Show 236 DR. H. GADOW ON MEXICAN [June 6, Late Eocene, or early Oligocene, times mark a period of considerable local subsidence which drowned the Antillean land, or islands, except their summits. Late Oligocene, or early Miocene, mark a period of considerable elevation with most important Text-fig. 32. Diagrams to illustrate the contours of Mexico at different geological ages. results :-Establishment of the continuity of North and Central with South America, and a continuous mass of land from Central America, north and eastwards, comprising the Greater Antilles and the southern end of Florida. For this Central Land (Antilles + Central America proper, and adjoining parts of South |