PLATE SECTIONS. 217 



On PI. ii of this volume will be found a geological section drawn 

 across the summit of Prospect Peak, exhibiting the relations of the great 

 body of Cambrian limestone to the crest of the ridge, the limestone here 

 rising to the top of the peak. The position of Prospect Ridge to the Ham- 

 burg Ridge is also more clearly shown than in the general section. The 

 same series of rocks at the northern end of the ridge across Ruby Hill and 

 Adams Hill are also shown on this plate. On the same plate a section is 

 given across Pinto ( Peak, and about 1 miles to the northward of the latter 

 section is another east and west section, drawn from the Pinto to the 

 Hoosac fault. 



