﻿ILLUSTRATIONS. 



Plate I. Line drawings, 11 figures. 



II. Fig. 1, quartz diorite (No. 12) X 15, polarized light; fig. 2, quartz 



diorite (No. 153) X 15, polarized light. 

 III. Fig. 1, hypersthene-augite andesite (No. 106) X 9, ordinary light; 



fig. 2, andesitic tuff (No. 101) X 9, ordinary light. 

 VI. Fig. 1, andesite porphyry (No. 132) X 9; fig. 2, feldspar porphyry 



(No. 23) X 9. 

 V. Fig. 1, foraminiferal limestone (No. 108) X 15 approx. ; fig. 2, gray- 

 wacke (No. 127) X 10. 



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