1914] English: The Fernando Group near Neivhall, California 213 



Arnold and Anderson's work in the Santa Maria district 1 - led 

 them to believe that "at least five and probably six distinct horizons 

 are recognizable in the Fernando by means of characteristic fossil 

 faunas, . . . Those at b, c, d, and e are of marine origin, are closely 

 related, belong at the base of the Pliocene, and are in a general way 

 the equivalents of the middle Pnrisima and lower and upper San 

 Diego formations." This group, which includes most of his listed 

 species, seems to be somewhat younger than the lower Fernando fauna 

 listed by the writer. 



A comparison of faunal lists shows the lower Pnrisima 13 to contain 

 fifteen species in common with the lower Fernando as listed by the 

 writer; of these species the following range down into the Santa 

 Margarita or San Pablo formations : 



Area trilineata Conrad Panopaea generosa Gould 



Crepidula princeps Conrad Phaeoides acutilineatus Conrad 



Cryptomya ovalisf Conrad Solen sicarius Gould 

 Macoma nasuta Conrad 



The following species, common to the lower Fernando and lower 

 Pnrisima, have not been listed from below the Purisima: 



Bathytoma carpenteriana, Pecten healyi Arnold 



var fernandoana Arnold Pecten oweni Arnold 



Nassa waldorfensis (var.?) Arnold Pisania fortis var. angulata Arnold 



Nucula castrensis Hinds Olivella intorta Cpr. 

 Paphia tenerrima Cpr. 



Most of the preceding species are characteristic of this horizon and 

 indicate a close relationship in age between the lower Purisima and 

 the lower Fernando. 



The fauna listed by Arnold and Anderson 14 from the Etchegoin 

 of Coalinga contains eighty-four determined species, of which eighteen 

 are common to the lower Fernando, ten of these being found in the 

 Purisima also. Most of the species common to the Fernando and the 

 Etchegoin have an extended vertical range, so that the relationship is 

 not so definitely shown as between the Fernando and the Purisima. 

 It is probable that the lower Fernando and the Etchegoin do not 

 differ greatly in age. 



32 Arnold, Ralph, and Anderson, Robert, Geology and oil resources of the 

 Santa Maria oil district, California, U. S. Geol. Survey Bull. 322, pp. 57-60. 

 1907. 



^sBranner, J. C, and others, Santa Cruz Folio No. 163. 



14 Arnold, Ralph, and Anderson, Robert, Geology and oil resources of the Coa- 

 linga district, California, U. S. Geol. Survey Bull. 398, p. 125, 1910. 



