800 



NEW YORK STATE MUSEUM 



Feet 



Port Eiccn limestone 25 



This is a dark lime sandrock resembling closely the 

 Coeymans, and like it containing chert. The 

 beds are transitional from the Becraft to the 

 Oriskany both lithically and faunally. The best 

 exposures are on the wood road which leads 

 southward from the Jones quarries across the 

 top of the hill. Among the common fossils are : 

 Monotrypella tabu lata (Hall) and 

 Spirifer concinnus Hall (lower and 

 middle beds), bnt such characteristic Oriskany 

 species as C 1 a d op o r a s t y p h e 1 i a , Or- 

 thothetes becraftensis, Stropheo- 

 d o n t a magnifica and E a t o n i a pe- 

 culiar i s also occur. 



Becraft limestone 40-50 



This is the type locality for this formation. It is 

 abundantly exposed in the quarries on the moun- 

 tain, being extensively used at present 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: 



Aspidocrinus seutelliformis Hall (in the lower bed) 

 Spirifer coneinnus Hall 

 Sieberella pseudogaleata Hall 

 Uncinulus camipbellanus (Hall) 

 Atrypa reticularis (Linn.) 



Neto Scotland si talc 70-75 



These are thin bedded calcareous and silicious clay 

 mudrocks sometimes approaching to impure 

 limestones. They represent a nearer shore de- 

 posit than the corresponding beds of Schoharie, 

 though (heir thickness is less than in that region. 

 Fossils, though abundant, are generally only 

 preserved as molds. The following species arc 

 common : 



Orthothetes woolworthanus Hall 

 StropheodK>nta becki Hall 

 Stroplionclla hieadleyana Hall 

 Leptaena rhoinboidalis (Wilckens) 

 Spirifer macropleura (Conrad) 

 s. perlamellosus Hall 



Eatonia medialis Vanuxem 

 Dalmanites micrurus Qrcen 

 D. nasurus Conrad 



The best exposures are In the quarry at the crusher 

 near Joneslmrgh and above Ihe cliff on the east- 



