C4 



NEW YORK STATE MUSEUM 



Stropheodonta cayuta Hall 

 Leptostrophia perplana Conrad var. 



nervosa Hall 

 Orthothetes chemungensis Conrad 

 Productella lachrymosa Hall 

 Spirifer mucronatus Conrad mut. 

 S. mesacostalis Hall 

 Atrypa hystrix Hall 



Ambocoelia umbonata Conrad 

 Cyrtina hamiltonensis Hall 

 Liorhynchus mesacostalis Hall 

 Hydnoceras tuberosum Conrad 

 H. variabile Hall & Clarice 

 H. legatum Hall & Clarke 

 Ceratodictya annulata Hall 

 Hydriodictya cylix Hall <& 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 have not been increased by later obseryations. These 

 occur in the beds on High point, Naples : 



Rhynchodus sp. 



Cladodus sp. 



Pterinea sp. 



Orthis infera Calvin 



Scbizophoria iowensis Hall 



Stropbeodonta cayuta Hall 



S. arcuata Hall 



S. canace Hall & Whitfield 



S. variabilis Calvin 



S. exilis Calvin 



Stropbonella reversa Whitfield (1) 



Ortbotbetes cbemungensis Hall 



Cbonetes setiger Hall 



Productella speciosa Hall 



P. dissimilis Hall 



Spirifer disjunctus Sowerhy 



S. orestes Hall S Whitfield 



S. subattenuatus Hall 



S. mesacostalis Hall 



S. bimesialis Hall 



Ambocoelia umbonata Conrad 



Atrypa aspera Hall 



A. hystrix Hall 



A. reticularis Linn^ 



Camarotoecbia contracta Hall 



Hypotbyris pugnus Martin 



Fistulipora occidens Hall & Whitfield 



Polypora sp. 



Fenestella sp. 



Zapbrentis sp. 



Receptaculites sp. 



Dadoxylon clarkei Dawson 



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 lowan Devonic with 

 that of New 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 



