>^v'%.\,-.. 



> v^ 1 





Fig. 4 The schistose phase of the Poughquag quartzite in the Peekskill 

 area. Xicols crossed, magnification 6s diameters. The rock carries con- 

 siderable pyrite, carbonate and sericite in addition to the quartz and feldspar. 

 Note the small dimensions and elongate character of the grains. 



