Geology from a Motor Car 411 



the Golden Gate bridge and Sausalito to San Rafael, Petaluma 

 and Santa Rosa, 47 miles, thence north 25 miles to Geyserville 

 (and the geysers 15 miles east of the highway); up Russian 

 River to Hopland and Ukiah, to Willits (134 miles north of 

 Sausalito) , and Richardson Grove (201 miles from Sausalito) . 



If desired leave San Francisco via the Oakland Bay bridge 

 to Oakland and Berkeley, crossing Carquinez Strait to Vallejo, 



Photo by Redwood Empire Association 



FIG. 106. Historic Bale Mill, near St. Helena. Erected in 1846. The 

 wheel is forty feet in diameter. 



thence through Napa Valley, famed for its fine wines, vine- 

 yards and wine cellars, passing Napa, St. Helena and Calistoga 

 (here are the geysers, and the petrified forest is near) , thence 

 over Mt. St. Helena and Cobb Mountain to Lower Lake. From 

 Lower Lake proceed around Clear Lake, east shore, or west shore 

 over Mount Konocti and Glass Mountain (Glass Mountain is 

 composed of obsidian or volcanic glass) to Upper Lake, to 

 Ukiah and Willits. 



