Cartography of California. 183 



Folio No. 31, Pyramid Peak. Topographic sheet, scale 

 1 : 125,000 ; areal geology sheet ; economic geology sheet ; 

 structural sections. 



The Pyramid Peak quadrangle includes the territory between the 

 meridians 120 deg. and 120 deg. 30 min. west longitude and the 

 parallels 38 deg. 30 min. and 39 deg. north latitude. 34.5 miles 

 long and 27 miles wide, and contains 931.5 square miles. Portions 

 of Placer, El Dorado, Amador, Calaveras and Alpine counties ; east- 

 ern El Dorado County occupying the central and main portion of it. 



Folio No. 37, Do^^Tiieville. Topographic sheet, scale 

 1 : 125,000 ; areal geology sheet ; economic geology sheet ; 

 structural sections, with special illustrations. 



This folio includes the territory between the meridians 120 deg. 

 30 min. and 121 deg. west longitude and the parallels 29 deg. and 

 30 deg. 40 min. north latitude. Area, 919 square miles. The map 

 of the gold belt extends over portions of Sierra and Plumas 

 counties. 



Folio No. 39, Truckee. Topographic sheet, scale 1 : 125,000 ; 

 areal geology sheet; economic geologj^ sheet; structural 

 sections. 



This folio includes the territory between the meridians 120 deg. 



and 120 deg. 30 min. west longitude and the parallels 39 deg. and 



39 deg. 30 min. north latitude. Area, 925 square miles. Portions 

 of Nevada County. 



Folio No. 41, Sonora. Topographic sheet, scale 1 : 125,000 ; 

 areal geology sheet; economic geology sheet; structural 

 sections. 



This folio includes the territory between the meridians 120 deg. 

 and 120 deg. 30 min. west longitude and the parallels 37 deg. 30 

 min. and 38 deg. north latitude. Area, 944 square miles. Portions 

 of Stanislaus, Merced, Tuolumne, and Mariposa counties. 



Folio No. 43, Bidwell Bar. Topographic sheet; historical 

 geology; economic geology; special illustrations. 



This folio comprises the territory between the meridians 121 deg. 

 and 121 deg. 30 min. west longitude and the parallels 39 deg. 30 

 min. and 40 deg. north latitude. Area, 918 square miles ; 34.5 

 miles long and 26.5 miles wide. The larger part is in Butte and 

 Plumas counties. 



