170 



AN AMERICAN GEOLOGICAL RAILWAY GUIDE. (CAL.) 



11. The mountains westward are like those from Pleasanton to Niles, with more 19. Tertiary, 

 19 b. Miocene and 18. Cretaceous. Also 20. Quaternary, volcanic and granite in places. The only 

 coal now worked is north of Mt. Diablo and south of Livermore. The granite, of the coast 

 ranges at least, is eruptive, and belongs rather to the Quaternary than the Archaean. 



12. The mountains eastward resemble those farther to the south, but with more 18. Cretaceous, 

 some 13. Sub Carboniferous near the middle, and a vast 20. Quaternary volcanic field northward. 



13. Mt. Shasta, 14,400 feet high, is in view. 



14. The fossil forest is on this route. 



15. The hills on both sides are metamorphic (18. Cretaceous?), with volcanic outbursts increas- 

 ing toward the northeast, and with quicksilver deposits. 



16. St. Helena Mountain is 4,343 feet high. 



17. Tunnel through 18. Cretaceous and 19. Tertiary hills. 



18. The coast range westward, 5.000 to 8,000 feet high, is little explored, but resembles that 

 south of San Francisco Bay. with much more volcanic, and towards the north auriferous, but only 

 granitic or metamorphic rocks, containing the gold quartz, underlie the cretaceous, as far as now 

 known. 



19. The most northern group of " Big Trees" is approached by this route. 



20. Passing into 19. Tertiary, 19 c. Pliocene and 1. Archaean (granite) below it. 



