Vol. VII] WARING— STRATIGRAPHIC AND FAUNAL RELATIONS 47 



and Tejon. In so doing he combined Merriam's locality No. 3, 

 which was called upper Martinez, with locality No. 4, which 

 was called near upper Martinez. The line should have been 

 drawn below locality No. 4, and that fauna placed in the Tejon 

 with species from locality No. 5. In his discussion, Dr. Mer- 

 riam applied the name Martinez to that portion of Gabb's 

 Martinez group which remained after the removal of the Chico- 

 Cretaceous element. The following species listed by Weaver 

 have been found only in the Tejon: 



V enericardia planicosta hornii Gabb, Megistostoma striata 

 Gabb, Modiolus ornatiis (Gabb), Galeodca tuberculata 

 (Gabb), Tellina martinezensis Weaver, Tellina hornii Gabb, 

 Thracia karquinezensis Weaver, Turritella conica Weaver, 

 Turritella infragramdata Gabb, Nyctilochus eocenicus 

 (Weaver), and Fusus (Eqiiilateralis Weaver. Some of the 

 other species are also questionably Martinez. 



In 1910, R. E. Dickerson^" found a section north of Mt. 

 Diablo, which showed an unconformity between the Martinez 

 and Tejon and listed a characteristic Martinez fauna. Dr. 

 Dickerson says : "The evidence of relationship of the Martinez 

 to the Tejon formation is based (1) upon areal mapping of 

 the beds containing characteristic faunas of these formations; 



(2) upon variation of strike at the contact of these formations; 



(3) upon variation in dip throughout the area studied; (4) 

 upon the presence of a conglomerate which marks a very de- 

 cided change in sedimentation at the base of the Tejon." 



In bulletins issued from the Department of Geology, Uni- 

 versity of California, since this manuscript was originally pre- 

 pared, Dr. Dickerson has revised the early work on the Mar- 

 tinez of California, and has described Martinez strata and their 

 fauna from Lower Lake, Benicia, Martinez, Selby, north of Mt. 

 Diablo, south of Mt. Diablo, San Pedro Point, San Mateo 

 County, and at Rock Creek on the western border of the 

 Mohave Desert region. 



The Tejon. — Forty years ago Dr. Cooper^^ was trying to ac- 

 count for the non-deposition of Eocene sediments in California. 

 Today we are trying to account for their erratic distribution in 



"Dickerson, R. E., Univ. Calif. Publ. Bull. Dept. Geol., vol. 6, pp. 171-7, 

 1911. 



"Cooper, J. G., Cal. Acad. Sci., vol. S, 1873, pp. 419-422. 



