228 University of California Publications in Geology [Vol. 10 



4. The strata above the Santa Margarita and below the Tulare 

 belong to one period of deposition. 



5. The Santa Margarita-San Pablo fauna is distinctly different 

 from that of the Etchegoin. 



6. As shown by both invertebrates and the vertebrates, the whole 

 Etchegoin is of Pliocene age. 



7. An unconformity occurring in the lower portion of what has 

 been mapped as the Etchegoin southeast of Coalinga is probably 

 the line of division of the Etchegoin from the underlying Santa 

 Margarita. 



8. An unconformity occurring in the Etchegoin north of Coalinga 

 above the "Glycimeris zone" is probably of only local importance. 



9. Four distinct faunal zones have been recognized in the Etche- 

 goin. 



10. The lower Etchegoin is most closely related to the lower Fer- 

 nando near Newhall, while the upper Etchegoin is most closely related 

 to the lower part of the Pliocene beds at Sargent. 



Description of Etchegoin Invertebrate Localities 



Out of about two hundred fossil localities in the Etchegoin near 

 Coalinga and in the adjoining regions the following have been selected 

 as showing typically the faunal association of the Etchegoin. 



All townships and ranges referred to Mount Diablo Base Line and 

 Meridian. 



2089. Middle of eastern boundary of NW % of NW % Sec. 19, T. 19 S, R. 16 E. 



Mya zone, uppermost Etchegoin. 

 2091. On west slope of 1100-foot hill near NE corner of NW % Sec. 26, T. 19 S, 



R. 15 E. Vertebrate and invertebrate locality, lowest invertebrate 



fossiliferous zone. 



2093. In creek bed immediately east of 900-foot hill, SE corner of NW % of 

 NW % Sec. 13, T. 19 S, R. 15 E. Lowest invertebrate fossiliferous 

 zone, type section of the formation as used by Arnold and Anderson. 



2096. Near middle of eastern boundary of SW % of SE % Sec. 35, T. 19 S, 

 R. 15 E. In this area the lowest invertebrate fossilferous zone. 



2104. Middle of northern boundary of NE % Sec. 12, T. 21 S, R. 14 E. Upper 

 Etchegoin. 



2110. Middle of southern boundary of Sec. 1, T. 21 S, R. 14 E. Upper middle 

 Etchegoin. 



2376. Middle of southern boundary of SE % of SW % Sec. 6, T. 20 S, R. 16 E. 

 Pecten coalingensis zone. 



