rise. 
468 ELEMENTARY GEOLOGY 
The climate of the Cretaceous seems to have been 
more uniform and warmer than that of the preced- 
ing period, and plants and animals now found in 
temperate regions, then lived in the Arctic. 
In the east, slight changes occurred at the close of 
m7, I N 107p 
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Sketch Map to show the C a 
HYPOTHETICAL EXTENSION Oo F OF xy 
OF LAND gv # CoN As 
IN THE CRETACEOUS ‘ 87 a oS 
Fic. 262. 
Hypothetical distribution of land shown by shading. 
the Cretaceous; but in the west, the close of the 
period was marked by a revolution in the geography. 
Much of the Cordilleran region was raised above the 
sea, and the lofty mountains, which were mainly 
developed in the next period, in this one began to 
As in the Carboniferous, when the Appalachians 
