PINE-LIZARD AND ITS ALLIES: REPTILIA 363 



whole of our continent, with the exception of a strip along 

 the South Atlantic and Gulf coasts, was above the level of 

 the sea (Fig. 188). During the Age of Reptiles a tropical 

 climate extended far toward the poles, but with the upheaval 

 of the great land-masses a gradual lowering of the temper- 



FIG. 188. North America after the Mesozoic Upheaval 

 (From Dana's Manual of Geology) 



ature took place, which affected the vegetation. In connec- 

 tion with these changes occurred a wide-spread destruction 

 of species, similar to that which took place at the close of 

 Paleozoic Time. Professor Dana says that no American spe- 

 cies of vertebrate and no marine invertebrate is known to 

 have lived both before and after the Mesozoic upheaval. 



