BULL. GEOL. SOC. AM. 



VOL. 16, 1904, PL. 77 



Figure I. — Section (4(5) of Amphibolite 



Showing central mass of secondary quartz and feldspar with secondary zoisite and 



hornblende 



Figure 2.— Typical Amphibolite (Section 58a) with small amount of Epidote 

 PHOTOMICROGRAPHS OF AMPHIBOLITE 



