

7 



% 



^^> 



V i ^ 



j^v«,..r^:-^...^..^ 



^- 



Fig. 7 Photomicrograph taken in ordinarj 



magnification 6; diam- 



eters. Specimen of Poughquag quartzite from a ledge resting unconformably 

 on the gneiss, about three-fourths of a mile west of Ladue's farm; the 

 rock is inferior to that shown in figures 5 and 6. Note the distribution 

 and quantity of minerals other than quartz. 



