42 



University of California Publications in Geology [Vol. 10 



correlated the Los Angeles clays with the middle Fernando formation. 

 Dr Arnold regards the beds as of lower or middle Pliocene age. 9 



The species upon which this correlation was based are as follows : 



Area multicostata Sby. Pecten pedroanus Trask (abundant) 



Astarte, sp. Pecten stearnsii Dall 



Carditoid Buccinum, sp. indet. 



Lima liamlini Dall Fissuridea murina Cpr. 



Macoma, sp. indet. Neverita recluziana Petit 



Nassa hamlini Arnold Pleurotoma, sp. indet. 



Pecten ashleyi Arnold Priene oregenensis Eedf. var. 



Pecten latiauritus Conrad angelensis Arnold 



Pecten opuntia Dall ! 



Pecten opuntia, Fissuridea murina and Neverita recluziana occur 

 also in the fauna from the Fourth Street locality. 



It is believed that the fossils obtained by Mr. Gilbert support this 

 correlation in part, and that in addition to increasing considerably 

 the known fauna of the Fernando, they present the opportunity of 

 making a more exact comparison of the southern Pliocene with that 

 of the Great Valley and of central California. 



List op Species 



In the succeeding faunal list a rough statement of the frequency 

 value of each species is attempted by an arbitrary division of the fauna 

 into four classes which are enumerated and designated as follows : 

 (1) very abundant ; (2) common; (3) uncommon; (4) rare. Forms 

 represented by more than twenty-five individuals have been classed 

 as ' ' very abundant ' ' ; those which appear in only one or two individuals 

 are "rare." In the column headed "Geologic Range," R indicates 

 Recent ; PI, Pleistocene ; P, Pliocene ; M, Miocene. The ranges given 

 are those heretofore recognized. 



RHIZOPODA Frequency Range 



Nodosaria, sp 4 



Anthozoa 



Astrangia insignifica Nomland 4 P 



Bryozoa 



Several species 1 



Brachiopoda 



Terebratalia hemphilli(?) Dall 4 P 



Laqueus jeffreysi( ?) Dall 4 P-E 



Amphineura 



Chiton i 4 



o Arnold, K,, Prof. Paper, U. S. Geol. Surv., no. 47, p. 29, 1906. 



