Plate 37 



Photomicrograph of no. 47. Annsville phyllite. Taken with crossed nicols, 

 magnification about 25 diameters. 



Taken to show one of the more granular varieties of this phyllite. Note 



a The numerous large quartz grains 



b The general phyllitic habit of the rest of the field 



The important constituents are quartz and mica. Other matters are of 

 small consequence. 



Plate 38 



Photomicrograph of no. 158. Annsville phyllite. Taken with crossed 

 nicols, magnification about 25 diameters. 



This specimen shows the typical phyllitic structure and the compositioa 

 which is alm.ost wholly quartz granules and mica flakes. 



