304 



NEW YORK STATE MUSEUM 



1 Bellerophcm sp. rr 



2 Nyassa arguta Hall rr 



3 N. recta Hall rr 



4 Ortbouota parvula Hall r 



5 Paracyclas lirata (Con.) Hall r 



6 Spirifer granulosus Hall a 



7 S. mucronatus (Con.) J3/77. r 



8 Orthis ( Schizopboria ) impressa #(/// r 



9 Chonetes scitulus Hall r 



10 C. cf. setigerus Hall r 



11 C. coronatus (Con.) Hall rr 



12 Pleurotomaria rotalia H"aZZ (?) rr 



13 Orthoceras sp. rr 



14 Palaeoneilo plana flaZZ rr 



15 Xuculites oblongatus (Con.) Hall rr 



16 N. triqueter Cow. rr 



17 Nucula corbuliformis IZa?/ r 



18 N. bellistriata (Con.) Hall r 



19 Plant stems rr 



20 Modiomorpha concentrica (Con.) Hall r 



21 Granirnysia sp. rr 



22 Dignomia alveolata (Hall) H. and C. rr 



23 Lingula densa Hall r 



Onondaga limestone 



Light bluish gray dense-textured and massively 

 bedded limestone with much chert in thin beds and 

 elongated lenses, most frequently in the upper bed. 

 The basal beds are often silicious or argillaceous 

 lime sandrocks forming passage beds from those 

 below. The commoner fossils occur in it, -specially 

 A t r y p a retieulari s, Leptostrop hia 

 per plana, P 1 a t y c e r a s d u m o s u m , 

 Lep taena rlio m b o i d a 1 i s , etc. 



Schoharie and Esopus 



Argillaceous quartz sandrock to silicious clay mud- 

 rock, dark colored often black when fresh and 

 commonly much cleaved, seldom shaly. On 

 weathered surfaces it breaks up into small 

 irregular checkers. S p i r o p h y t o n c a u d a - 

 galli occurs on some surfaces. In the upper 

 layers occur Lepitocoelia a c u t i p 1 i c a t a, 

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

 These layers become more calcareous and merge 

 into the overlying Onondaga. 



Oriskany 



Quartz conglomerates, and sandstones or quartzites, 

 calcareous quartz sandrock and silicious lime 

 sandrock. Fossils are abundanl and in the decom- 

 posed portions weather in relief making specimens 

 of great beauty. Van Tngen and Clark list 94 



