70 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



the period, and was accompanied by extensive intrusions 

 of peridotite in the Coast Range region of California and 

 Oregon. 



Succeeding the post-Knoxville elevation, the next great 

 movement was that inaugurating the Dakota and later 

 Horsetown disturbances, which later were followed by the 

 great overlaps, extending along the Pacific border of both 

 North and South America, from the coast of Chile to 

 British Columbia, and in the interior basin, carrying the 

 Upper Cretaceous far northward along the flanks of the 

 Cordilleras. It was therefore of an epeirogenic nature, 

 extending in longitude as well as latitude over great inland 

 areas. 



The close of the Chico epoch is not yet sufficiently well 

 understood for any final statements; but the faunal differ- 

 ence between this epoch and that of the Martinez, as 

 restricted by J. C. Merriam, shows a hiatus, probably be- 

 tween the Chico and the Eocene deposits of the Pacific 

 border. 



The different members of the Cretaceous series of Cali- 

 fornia find their counterparts in other portions of the Pacific 

 border, in British Columbia, Mexico and Chile, and are to 

 be closely correlated with the recognized members of the 

 interior basin deposits, with those of Asia and of Europe. 

 This is shown not only by the parallelism of their develop- 

 ments, but also by their faunal resemblances, amounting 

 often to close specific affinities, and even specific identity. 



The crustal movements that have affected the Pacific 

 border of America have been much more general than has 

 been commonly believed. Simultaneous disturbances of 

 the same tendency may be traced in many of the great 

 Cretaceous series of the world. 



