52 



GEOLOGIC GUIDEBOOK ALONG HIGHWAY 49 



[Bull. 141 





Fio. 21. View south down the North Fork of the American River from the High- 

 way/ 49 bridge at the El Dorado-Placer County line. The abandoned Pacific Portland 

 Cement Company railroad bridge may be seen in the background. The beveled bedrock in 

 the right foreground is a green meta-volcanic of doubtful age. 



FIG. 23. 



Adit and buildings of the Pacific Minerals Company slate mine on the North 

 Fork of the American River two miles north of Placerville. 





FIG. 22. 



Potholes worn in granodiorite bedrock in the streambed of the South Fork 

 of the Yuba River immediately east of the Highway 49 bridge. 



L 



Fio. 24. Looking northwest toward Tuolumne Table Mountain from the vicinity 

 of the Omega and Rawhide mines. Dumps and buildings of the Rawhide mine may be 

 seen in the upper left part of the picture. Photo by Olnf P. Jenkins. 



