28 



University of California. 



Vol. i. 



On the summit of the hill between the San Jose canon and Car- 

 melo River, at an elevation of 800 feet, some fragments of bone 

 were found in the chalky shale. 



Distribution, Thickness, Structure, etc. — The areal distribution of 

 the rocks of the Monterey series is very closely as it is represented 

 on the map. The only condition which renders the precise demar- 

 kation of the western edge of the terrane difficult, is the fact that this 

 edge is mantled with the variably thick terrace formations, and the 

 latter are in places so thin that the underlying shale is apparent, so 

 that it is not easy to say where the line between the two formations 

 should be drawn. Our mapping, it will be noticed, is at variance 

 with a statement made by Dr. Becker,* to the effect that "along 

 the shore of Carmelo Bay Miocene schists have been locally altered 

 to a cindery mass as if by the action of heat." This is an error; and 

 the only rocks comparable to the description are the laminated 

 lavas of carmeloTte described in detail in a subsequent portion of 

 this paper. The geological survey of California seems to have en- 

 tertained a notion with regard to these eruptives similar to that 

 expressed by Dr. Becker. There are, however, no Miocene rocks 

 along the shore of Carmelo Bay, neither are there any metamorphic 

 rocks. Eastward and northeastward of Carmelo Bay the rocks of 

 the Monterey series have an extensive distribution in continuity 

 with the exposures within the limits of our map. They may be 

 seen extending up the Carmelo on both sides of the valley for sev- 

 eral miles in gently undulating folds, with a prevailing northeasterly 

 dip at low angles (probably io° on an average). On the road to 

 the town of Monterey they are well exposed, with a prevailing 

 northerly dip toward the Bay of Monterey at angles of from 5 to 

 10°. 



As regards the thickness, only a minimum value can be obtained 

 within the area examined. The hill between the Carmelo River and 

 San Jose Creek presents an unbroken section of the shale from near 

 sea level to its summit at 800 feet, and the dip of the strata is east 

 northeast at angles ranging from 12 to 21 , thus showing directly, 

 by mere inspection of the cliff (see section A- A', Plate 1) that the local 



* Loc. cit. 



