Vol. 4] Weaver. — Palaeontology of the Martinez Group. 



105 



relations between the two localities it does not seem probable that 

 it ever existed. At the present time these are the only localities 

 where beds of distinct Martinez age are recognized. 



STEATIGRAPHIC RELATIONS. 



The stratigraphic relations existing between the Martinez and 

 either the Chico below or the Tejon above throw little light upon 

 its separation as a distinct formation. As yet no contact has been 

 observed where the exact relations between them can satisfac- 

 torily be determined, and at no locality in this region has a dis- 

 tinct angular unconformity been noticed. 



In the vicinity of the Strait of Karquines the Chico, Mar- 

 tinez, Tejon and Monterey have all participated in the folding of 

 the strata, which has resulted in the formation of a synclinal 

 trough the axis of which has a northwest to southeast trend. The 

 apex is situated about four miles to the north of Benieia. The 

 maximum width of this syncline, extending from a short distance 

 west of Pacheeo on the east to Del Hambre Canon on the west, 

 is about four miles. In this cross-section the Chico, Martinez, 

 Tejon and Monterey are found in succession toward the center 

 of the syncline. The same holds true on the northern side 

 of the straits, except that the Monterey is not represented. 



To the south and west of Martinez, on the western limb of the 

 syncline, all of these beds clip at high angles to the northeast. 

 West of the syncline the Martinez becomes thinner, and is repre- 

 sented by a narrow strip extending up nearly to the head of Del 

 Hambre Canon. At this locality the Martinez, together with the 

 Chico, dip to the southwest. 



On the eastern flank of the syncline. beds of Martinez age 

 are represented immediately west of Bull's Head Point, and 

 south of this point they appear east of the road leading from 

 Pacheeo to Martinez. These, together with the Chico and Tejon, 

 dip steeply to the southwest. The strike of these beds carries 

 them across the Strait of Karqnines, where they again outcrop 

 just north of Army Point Station. At this point the formation 

 was so thickly bedded that it was difficult to obtain accurate 

 observations of the dip. Apparently, however, they dip at high 

 angles to the southwest. In this locality the outcrops are sepa- 



