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. 
DURING MIOCENE 
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 
