304 Ni:\V YOliK STATi: MUSEUM 



1 l^ollerophon sp. rv 



'2 Nyassa arK^ita Hull vr 



3 N. rec'tn //(/// rr 



4 Orthoiiota parvula //(/// r 



5 I'aracyclas lirala [Con.) /hill v 

 (I Spirifrr jxraiiuhisus //(/// a 



7 S. nnuTuiiatus (Co;/.) Hill, v 



S Orlliis ( Sclii/.oplinria I iinprcssa Hull v 



U I'lioiu'tt's si-ituhis JIdll V 



10 C. cf. setifiorus I hill v 



11 C. . C'onmatiis (C'oh.) Jhill ir 



12 Pleurotoinaria rotalia JIall (V) rr 



13 Orthocoras .s/>. rr 



14 I'alaooiH'ilo jtlaiia Hall rr 



15 Xiiciilitos ohloiiLTatus (Con.) If all rr 

 IG N. tri<iuot('r Co?;, rr 



17 Niu-iila corluiliforiuis //(/// r 



18 N. l)ellistriata (Co;;.) Hall r 



19 Plant stems rr 



20 M()(li()iiiori)lia concontrica (Co;;.) //(/// r 



21 (iraiiiinysia .s-/;. rr 



22 Dignoniia alvoolata (Jhill) II. and C. rr 



23 Liiigiila doiisa //(/// r 



Feet 



Onondaga limestone 75 



Ligiit bluish gray deiise-toxtiired and massively 

 bedded limestone with much chert in thin beds and 

 elongated lenses, most frequently in the upper bed. 

 The basal beds a-re often silicious or argillaceous 

 lime sandrocks forming passage beds from those 

 below. The coinmoner fossils occur in it, specially 

 A t r y p a reticular! s , L e j) t o s t r o ]> h i a 

 p 61 r p 1 a n a , IM a t y c e r a s d u m o s u m , 

 L e p t a e n a r li o m b o i d a 1 i s, etc. 



Schoharie and Esopus oOO 



Argillaceous quartz sandrock to silicious clay mud- 

 rock, dark colored often black when fresh and 

 commonly much cleaved, seldom shaly. On 

 Aveathered surfaces it breaks up into small 

 irregular checkers. S p i r o j) h y ton c a u d a - 

 gain occurs on some surfaces. In the upi)er 

 layers occmr L e ]» t o c o (H i a a, c u rt i |) 1 i c a t a, 

 A t r y p a s }) i n o s a, and an Orbiculoidea?. 

 These layers becoine more calcareous and merge 

 into the overlying Onondaga. 



Oriskany 5 -GO 



(^uarlz coiigloiiKM-ales, and sandstones or (]uartzites, 

 calcareous (|uai'lz sandrock and silicious lime 

 sandrock. b\)ssils are abundant and in (he decom- 

 I'oscd jtoi'lions weallier in relief making specimens 

 of [i\'i'\\\ hcaulN. \'aii I mien and (Mark list 94 



