N E W YORK STATE MUSEUM 



Stropbeodouta cayuta Hall 

 Leptostropbia perplana Conrad var. 



nervosa HaU 

 Ortbotbetes cbemungeusis Conrad 

 Productella laebryrnosa HaU 

 Spirifer uiucronatus Conrad niut. 

 S. mesacostalis HaU 

 Atrypa bystrix HaU 



Ambocoelia urabonata Conrad 

 Cyrtina baiuiltouensis HaU 

 Liorbyncbus mesacostalis Hall 

 Hydnoceras tuberosum Conrad 

 H. variabile HaU & Clarke 

 H. legatum HaU d Clarke 

 Ceratodictya annulata HaU 

 Hydriodictya cylix HaU d Clarke 



High Point sandstone 



The interesting fauna of the calcareous or firestone layer of 

 this formation was studied some years ago by the writer and its 

 species haye not been increased by later observations. These 

 occur in the beds on High point, Naples : 



Rbyncbodus sp. 



Cladodus sp. 



Pterinea sp. 



Ortbis infera Calvin 



Sebizopboria ioweusis Hall 



Stropbeodouta cayuta Hall 



S. arcuata HaU 



S. cauace Hall d Whitfield 



S. variabilis Calvin 



S. exilis Calvin 



Stropbonella reversa Whitfield (1) 



Ortbotbetes cbemungensis Hall 



Cbonetes setiger HaU 



Productella speciosa Hall 



P. dissimilis Hall 



Spirifer disjuuetus Soiceroy 



S. orestes HaU d- Whitfield 



S. subattenuatus Hall 



S. mesacostalis Hall 



S. bimesialis Hall 



Ambocoelia umbonata Conrad 



Atrypa aspera HaU 



A. bystrix HaU 



A. reticularis Linne 



Camarotoecbia contracta Hall 



Hypotbyris pugnus Martin 



Fistulipora occidens HaU d Whitfield 



Polypora sp. ' . 



Fenestella sp. 



Zapbrentis sp. 



Receptaculites sp. 



Dadoxylon clarkei Daicson 



In this unusual congeries we find the earliest appearance of 

 Spirifer disjunctus, which may be taken as indicating 

 the advent of the true Chemung fauna. It is also important to 

 note the very marked representation of species which were orig- 

 inally described from the upper Devonic of Iowa and have been 

 observed nowhere else in the Appalachian region except spas- 

 modically. 



Exact correlation of the stages of the Iowan Devonic with 

 that of Xew York is not practicable as the Siluric continental 

 barrier between was the cause of great differences in sedimen- 

 tation and fauna on its east and west sides, but this invading 

 western fauna intercalated in the normal Chemung fauna of 



