CALIFORNIA. 



171 



21. A ridge of marine 19 c. Pliocene Tertiary, full of shells, &c., lies west of the road for five 

 miles. 



22. Metam orphic Cretaceous hills west of road, and granite (1. Archaean?) helow. 



23. 19 b. Miocene (Tertiary) hills come near on the west. 



24. 18. Metamorphic Cretaceous hills on the west, mostly capped by 19 c. Miocene Tertiary 

 (marine.) 



25. The celebrated New Almaden Quicksilver Mines are not far west. 



26. Some Lignitic (19 a. Eocene and later) exists to the west, but has not yet been found 

 workable. 



27. Passes through the 18. Cretaceous hills, flanked by 19. Tertiary (19 a. Miocene and 19 b. 

 Pliocene) on the west. Some lignite in it. 



28. The hills to the southwest are metamorphic and granitic, with 19. Tertiary on their flanks 

 as before. 



29. Much 19. Tertiary on the slopes of hills around, with very fine marine fossils (19 b. Miocene 

 and 19 c. Pliocene). 



30. The New Idria Quicksilver Mine lies to the southeast in the highest part of this range of 

 mountains, near 5,000 feet elevation. 



31. The hills northward are metamorphic (18. Cretaceous?), with a great 19. Tertiary (19 b. 

 Miocene and 19 c. Pliocene) basin between them and the range north of San Fernando. To the east 

 more metamorphic and granitic, with auriferous quartz, copper, &c. The 19. Tertiary contains 

 much petroleum. 



32. A metamorphic (18. Cretaceous) hill north of this harbor. The islands visible are similar, 

 with some 20. Quaternary sandstone and Paleozoic rocks. 



33. About half way the metamorphic and granitic hills approach the road. Much 19 b. Mio- 

 cene Tertiary, with poor lignite, caps these on the west. 



34. Metamorphic auriferous rocks (secondary) overlying granite, chiefly on the west side. San 

 Barnardino Mountain is 11,600 feet high. 



35. The foothills are full of Tertiary fossils (Miocene and Pliocene). The metamorphic and 

 volcanic mountains contain valuable quicksilver mines. 



36. Some indications of quicksilver in the hills. Chromic iron and pyrolusite are also found in 

 targe quanties. 



37. Mt. Tamalpais, 2,W4 feet high, may be ascended here. Gives a magnificent view of the 

 country near Sau Francisco Bay. 



