300 NEW YORK STATE MUSEUM 



Port Encn liincsfone 



Til is is a dark lime saiulrock rosoiiihlinir closclv the 

 ( 'ocviiiaiis. and like it coiilaiiiiiiii chert. The 

 IkhIs are transitional from iho Becraft to the 

 Oriskany both lithirally and faunally. The best 

 exjjosures are on the wood road which leads 

 sonthward from tlie Jones qnarries across the 

 toj) of the hill. Among the common fossils are: 

 M u t r y p e 1 1 a t a b u 1 a t a ( Hall ) and 

 Spirifer c o n c i n n ii s Hall (lower and 

 middle beds), bnt snch characteristic Oriskany 

 species as C 1 a d o j) o r a s t y p li c 1 i a , () r - 

 t h o t h e t e s b e c r a f t e n s i s , S t r o j) h e o - 

 d o n t a m a g n i f i c a and E a t o n i a p e - 

 c n 1 i a r i s also occur. 



Bccraft limestone 



This is the type locality for this formation, ft is 

 abundantly exposed in the quarries on the moun- 

 tain, being extensively used at ])resent in the 

 manufacture of Portland cement. The rock is a 

 coarsely crystalline lime sandrock of light gray 

 color passing locally into a shell rock or coquina. 

 The most abundant fossils are: 



Aspidoci'imis sciitelliformis Hall (in the lower bed) 

 Spirifer concimius Hall 

 Sieberella })seii(iooaleata Hall 

 Uiiciiiulus campbellaiuis (Hall) 

 Atrypa reticularis (Linn.) 



NciD Scotland shale 



These are thin bedded calcareous and silicious clay 



mudrocks sometimes approaching to imi)ure 



limc^stones. They represent a nearer shore de- 



})Osit than the corresi)onding beds of Schohari(\ 



though their thickness is less than in that region. 



Fossils, though abundant, are generally only 



1 resei'ved as molds. The following species are 



common : 



Orthotliet.es woolworthaiuis Hall 

 Stropheodonta hecki Hall 

 Strophoiiella lieadleyaiia Hall 

 Lei)taeiia rlumihoidalls (WilcJccns) 

 Spirifer inacropleura (Conrad) 

 S. ])crlain(>ll()siis Hall 



Eatoiiia nuHlialis ] (inu,rcni 

 Daliiiaiiites iiiicnii'us Green 

 I ). nasiitus Conrad 



The best exposures are in the (piarry at the crusher 

 near Jonesbui'gh and above the clilY on the east- 



