Ries — Geology of Orange County. 



431 



Tentaculite, for the lower layers of the knoll contain Tentaculite fossils. 

 The limestone beds of the knoll dip 35° N. W., and strike N. 40° E. ; their 

 total thickness is about six feet, and they probably represent the transition 

 from Tentaculite to Lower Pentamerus. Sfroplieodonta var'istriata is present 

 in considerable abundance. 



These beds are overlaid by eight feet of Pentamerus limestone, w hich 

 forms a second knoll, and contains a number of imperfect fossils, besides an 

 abundance of Pentamerus galeatus, FavoHtes and Stromatqpora cf. ccmcentrica. 



These Pentamerus beds dip northwestward at the usual angle, 

 forming a short ridge about fifty feet to the northwest. The lower beds 

 of this ridge are the Pentamerus limestone, which passes into the Cats- 

 kill shaly limestone, forming the upper half of the section exposed in 

 this ridge. 



The Catskill shaly beds strike N. 40° E. and dip 35° N. W. ; they have 

 a pronounced cleavage, and are sometimes quite arenaceous. The usual 

 number of distorted fossils is present, with Spirifer macropleurus in great 

 abundance. The other species from the shaly layers which were identified 

 with certainty, were: Spirifer cyclopterus, Orthothetes, &p., Leptcena rkomhoi- 

 (/(//is, Spirifer perlamellosus, Phynchonella 7 s])., Ceelospira, sp., Pholidops,sp. 



The lower, more massive layers, exposed in the eastern face of the 

 ridge, and representing the transition from the Pentamerus to the Shaly 

 limestone (66a), afforded Orthis oblata, JRhynchonella, sp., Fenestella, sp., 

 St/t % opheodonta punctulifera, Eaton/a singularis, Stropheodonta Bechi, Ccelospird 

 dichotpma, Spirifer cyclopterus, Stropl/eodonta varistriata, var. arata, Penta- 

 merus galeatus, Parasites, sp., Astylospongia inornata, Orthis, sp., Da/ma- 

 nites, sp., and Ostracode remains. 



The total thickness of the Pentamerus limestone in this ridge and the 

 two knolls (63) previously mentioned, is about fifty feet. 



The Catskill shaly limestone beds exposed in the short ridge aggregate 

 about fifteen feet in thickness. 



There is a depression about 300 feet in width between ridge 66 and tin- 

 next one to the west (67), which is formed by the cherty limestones and 

 arenaceous shales of the Oriskany. This ridge skirts the Neversink river. 

 - The upper shaly layers apparently do not contain any remains, but the Lower 

 cherty ones are very fossiliferous, and extend nearly to the summit on the 

 eastern slope of the ridge. Lsptocodia flabettites and Spirifer arrectus are 

 present in great abundance, while the other species found were: Platyostoma 

 venbneomm, Platyqstoma depress/////, Reyrichia a/fa, Platyceras, sp., Ptliynoho- 



