44 ^^^^V YORK STATE MUSEUM 



to hare led to commercial development, or even to serious prospect- 

 ing, it is xnore than the average amount contained in the Grenville 

 mica gneisses and stylists, and is their most prominent field charac- 

 teristic 



The strarmn of pyritous ~t r -'- Pyrites is the most notable of 

 all in :h:5 resc^rt. Its :.: : : 5 a prominent vari^ated bufF to 

 brov : ^ rf T - TT : ill near High Falls, that 



is. c: : t r ^ -.:.-. - r r" tttsI a few yards np- 



strear: :r:: : t tt r :^t : 7 r t 7 r.e spot is marked by 



dece; t : i - :::.' t r: .diteriaL and is devoid of 



vege: \ : r : : ^ : :he hill in the for^roond 



ofpl^T: : rr :^r :t :::: the large amount of 



sulph : \ : - 7 : : r ^ t t ; :f the formation. 



T:\- r^ : : ^ : - 7 :.: :; r : -- points to the 



south 5 : 7 T : r 57 ^ : : rfit study by 



Proft 5 - 5 : . ^ : - 7 11 there- 



lore 



so: that is, i: :.\- -:^:::.. : v r : ^^ : - 



vine cotmtry rock, it is by a ver^r :rr: :::-::. t r. 



extremity of the exposed mass, v^ T T r : : : - 



and quartzitic schist a^>proaches :: :r 7 7 



sides, the pyritous gneiss is se^r. : :: r :7>scd by gabbro-d: r : r 

 anqihibolitic rock whose r : rr 7 unquestionab'.T _ ^ 



relationship is shown by Tir ::^: r:.i r : 5 i 5 t :::«3ns at the m: t 

 at both ends of the Pyrites gorge where the stratum is in:: 

 by the Grass river. The succession at each of these poin: 

 sketched in Smyth's p^)er (1912, pages 161-62, figures 26 

 where the pyritous gneiss is shown to be bounded above a:. : 

 by the basic intrusive. In all probability, however, the ore 

 the lower mouth of Ae goree doe- not end in the bed of rii- r. -r, 

 as intimated in the p^ier rtfrrrt nyth 1912, page 160), but 



curves round to the soutiiea upstream 00 the left 



bank, the apparent interr^ r^ ^ topographic feature. 



In fact the formation car - r : : ank of the Grass 



river, about 60 feet at : — south of the 



gossan above described. 7 : :^-c . ; ^ ::: leet long have 



