THE JURASSIC PERIOD 



407 



FIG. 432. Geography of North America as it is supposed to have been in 

 late Jurassic time. Dotted pattern represents sediments on land. 



the reverse of those which had brought in the sea, again 

 excluded it. In neither case were the strata disturbed, and 

 where there is any unconformity above the marine beds it 

 is barely detectable. 



Marine deposits along the Pacific slope. On the Pacific 

 coast there was a very different state of affairs. Throughout 



