130 



CALIFORNIA ACADEMY OF SCIENCES (P«oc. 4th Sm. 



being gradually increasing numbers of northern types such as 

 Chrysodomus. 



In the lower Pliocene there is a great influx of northern 

 forms such as Chrysodomus and Patinopecten, accompanied by 

 some Oriental elements such as Haliotis, and Pallium. These 

 mingled in southern California with northward-moving species 

 from the Panama fauna. 



In upper Pliocene the tropical species are nearly all gone, 

 and the fauna of Puget Sound has extended its sway southward 

 to San Diego. The relationships of the lower San Pedro 

 Pleistocene fauna are the same as those of the upper Pliocene, 

 with the northern facies still more distinct. 



The upper San Pedro fauna is southern in kinship, with 

 many species now living only in the Panama region. 



Climatic Range of West Coast Tertiary Forms 



q5. 



'•a 

 5^ o c 



WS o 



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o$ 



3-2 

 Q 8 



Oh 



Pecten caurinus 



Dwarf Venericardia. . 

 Giant Chrysodomus. . 



Miopleionia 



Argobuccinum 



Phacoides annulatus . 



Area trilineata 



Gyrineum 



Giant Turritella 



Lyropecten 



Janira 



Dosinia 



Dendraster gibbsi 



Pecten caurinus 



Argobuccinum 



Giant Chrysodomus. . . 

 Dwarf Venericardia . . . 

 Phacoides annulatus . . 



Lyropecten 



Janira 



Ficus. 



Miopleionia 



Pecten healeyi 



Area trilineata 



Astrodapsis 



Chione {gnidia group) . 



Giant Turritella 



Dosinia 



Trophon 



5S 



+ 



M 



+ 



+ 







