| OCR Text |
Show 1905.] AMPHIBIANS AND REPTILES. 235 and Guatemala, also the Mexican Sierra Madre del Sur. These parts were in time annexed by Sonoraland. By the late Eocene, conditions were so far consolidated that there existed the present North American Continent, eastern and Text-fig. 31. Diagrams to illustrate tlie contours of Mexico at different geological ages. western halves joined, and the latter extending southwards as the present Mexico and part of Central America. Brazilia had grown into South America, but the two continents were still separated, the Atlantic and Pacific communicating across the present Isthmus of Panama and probably further north. |
