230 



Prosser — Ujpper Hamilton and Portage Stages, etc. 



The next higher zone is well exposed along the south bank 

 of the river both below and above the N. Y., L. E. & W. K. K. 

 bridge, three miles northwest of Fort Jervis. The following 

 species were obtained from this locality : — 



1. Spirifera mesastrialis Hall (rr) 



2. Palceoneilo emarginata (Con.) Hall 



(rr) 



3. Leda diversa Hall - - -( r ) 



4. Microdon (Cypricardella) tenui- 



striata Hall (?) ... (rr) 



Possibly it is M. gregarius Hall, but 

 it resembles the former more closely. 



5. Orthonota carinata Con {rr) 



6. Palceoneilo plana Hall (rr) 



7. Paracyclas lirata (Con.) Hall.. (rr) 



8. Grammysia subarcuata Hall (?) (rr) 



9. Modiomorpha subalata (Con.) Hall 



var. chemungensis Hall(?) ..(rr) 



10. Actinopteria Boydi (Con.) Hall. (a) 



11. Homalonotus DeKayi (G-reen) Em- 



mons (rr) 



The zone from which the above species were obtained was 

 called Chemung by the Pennsylvania Survey ;* still the fauna 

 is not a Chemung but a modified Hamilton one and the zone 

 belongs to the Portage stage of central and eastern New 

 York. 



It seems clear to the writer that the above lists of fossils 

 with the statement of their stratigraphic position show that 

 the f ossiferous zone underlying the Oneonta sandstone in 

 Chenango and Otsego counties is not the top of the Hamilton 

 but belongs in the Portage stage. It appears to be well estab- 

 lished by careful study that the typical Hamilton fauna and 

 the higher or modified faunas, when considered in connection 

 with their stratigraphic position, may be traced for a long dis- 

 tance across eastern New York and Pennsylvania. The facts 

 briefly described in this paper, which have required a con- 

 siderable amount of investigation and study, are commended 

 to the attention of those engaged in the preparation of the 

 new geologic map of New York. 



Topeka, Kansas, May, 1893. 



* Ibid., p. 194, where it is stated that the Chemung commences about one-half 

 mile above the Erie railroad bridge and continues down the river for nearly two 

 miles. See also the geological map with the report. 



