;n4 



NEW YOKIv .STATi: MLSEU.M 



^J((iirt!n</inili (jrit 



Sili(iti('d«|uai*tz c'(mj»ioiiK'rat(MHakiii«»- ii.s tirst ai)j»ear- 

 aiice in the P.iimewalcM* i'('<ii()ii and iKM-oiuiiiii- most" 

 ]n-(Hiiiiioiit soutliwai'd, wIkmc il tonus the suimnit 

 of tlic Sliawau<»iiiik i-aii<»e. The iichhlcs arc lll(^sti^• 

 ^^('ll worn, ii"onerallv small or of moiieralo size, the 

 matrix l)(Mn,i>' a qnartz sand and silicions ciMmMit. 

 Locally it passes into a (|uartz sandstone or (juartz- 

 ito. Dai-ton reeords 45 feet near Kosendale and 

 100 fet^t in the ridges to the ;^onth. At Lake 

 ^rohonk he finds !()() feet; at Peterkill falls 210 

 feet, while near Ellenville it is abont 200 feet, 

 which is its average thickness in the Shawangnnk 

 r;inj.'(* [ti<i'. 205]. 



Feet 

 0-210 



Fig-. 205 



