BULL. GEOL. SOC. AM 











VOL. 14, 1902. PL. 62 



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Figure 1.— Hornblende Schist (X 90) 



Hornblende plates enclose black hematite scales and white zoisite grains or perforations caused by tlieii 

 dislodgment. Groandmass, colorless mosaic of limpid plagioelase and quartz 





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Figure 2.— IIkmatitk i\ JIukmu.knpe Schist (X 72) 

 Rounded zoisite granules appear in quartz groundmass 



PHOTOMICROGRAPHS OF HORNBLENDE SCHIST AND HEMATITE IN HORNBLENDE SCHIST 

 Morningside avenue wost nenr West <~>ne liundred and eijrhteentli street 



