472 



University of California Publications in Geology [Vol. 10 



The presence of Mylodon and the sabre-tooth tiger in such large 

 numbers at Rancho La Brea indicates that these forms flourished in 

 California during at least a portion of the Pleistocene. They rep- 

 resent forms which evidently ranged widely over the state, not only 

 over the Great Valley of California but into the foothill belts of the 

 Coast Ranges and Sierra Nevada as well. Their absence from certain 

 deposits should then be considered as of especial significance. The 

 presence of these forms and the absence of Oreamnos from the Hawver 

 Cave accumulation suggests that the fauna came somewhat more 

 under the influence of the plains than did the fauna of either Potter 

 Creek Cave or of Samwel Cave. It should also be remembered that 

 Hawver Cave is situated some 150 miles south of the Shasta caves. 

 The absence of grazing camels may be due to local conditions. It 

 seems possible that were more material recovered from Hawver Cave, 

 a still closer similarity to the Potter Creek Cave fauna would be found 

 to exist. 



The faunal differences existing between Hawver Cave and Potter 

 Creek Cave are then to be attributed in part to a geographic separa- 

 tion of the deposits and in part to a difference in age. Both Hawver 

 Cave and Potter Creek Cave contain types usually associated with 

 earlier portions of the Pleistocene, but certain forms found in each 

 deposit are absent from the other. Hawver Cave is distinctly nearer 

 Potter Creek Cave in age than is Samwel Cave. Final judgment on 

 the relative age of these accumulations can be given only when the 

 time and space-limits of the genera involved in this problem can be 

 more exactly stated for the Pleistocene. 



COMPARISON OP THE HAWVER CAVE FAUNA WITH THE 

 FAUNAS FROM PORT KENNEDY DEPOSIT 

 AND CONARD FISSURE 



The vertebrate remains from the Port Kennedy bone deposit of 

 Pennsylvania have been described by E. D. Cope. According to 

 Osborn 7 this fauna is characterized by a great predominance of extinct 

 forms, for ' ' Out of a total of thirty-six genera ten are now extinct, 

 and out of forty-seven identified species twenty-nine are now extinct 

 (Mercer). " 



The Hawver Cave fauna compares favorably with that from Port 



6 Cope, E. D., Vertebrate remains from Port Kennedy bone deposit, Jour. 

 Acad. Nat. Sei. Phila., ser. 2, vol. 11, pp. 193-267, pis. 18-21, 1899. 



7 Osborn, H. F., The age of mammals in Europe, Asia and North America 

 (N. Y., Macmillan, 1910), p. 470. 



