Prosser — -Hamilton and Chemung Series. 



mi 



Prosser, in 1893, reviewed the evidence in relation to the presence of the 

 Tiilly limestone near Smyrna, and showed that the higher fossiliferous zones 

 at Norwich and Oxford, twelve and nineteen miles farther south must occur 

 above the to]> of the Hamilton, instead of forming the upper part of the 

 Hamilton formation. 1 Finally, J. M. Clarke, in 1H94, has shown the same 

 stratigraphic relations for the rocks somewhat farther west in the northwestern 

 part of Chenango county.' 2 



The various streams and steep hills of Smyrna township afford good 

 exposures of the rocks, and on account of the importance of this locality in 

 determining the line of separation between the Hamilton and Chemung series, 

 the sections along Pleasant brook and other streams were carefully examined. 



XVIII D\ 3 East of Smyrna village are exposures along the small 

 brook which enters Pleasant brook from the north, below the railroad station, 

 about two miles west of the Chenango river. The lowest exposures on the 

 brook, D 1 , are only a, few feet above the level of the railroad. They are 

 generally somewhat coarse, arenaceous, blue shales, certain layers of which 

 contain abundant fossils. There are, also, occasionally, thin and irregular 

 strata which are quite calcareous, but not very fossiliferous. The fauna 



is as foil 



ows : 





- 1. 



Tropitloleptitx c((ri»ati(s (Con.), Hall. 



(c)« 



2. 



Spirifer mucronatus (Con.), Bill. 





3. 



Spirifer audaculus (Con.), Hall and Clarke - - 







{Spirifer medidlis, Hall). 





4. 



Niuileoxpi ra concinina, Hall. 



(rr) 



5. 



Spirifer gra/rmlosus (Con.), Hall and Clarke. 



(IT) 



6. 



Athyris spwiferoides (Eaton), Hall. 



(*) 



7. 



StiropTieodonta perplana (Con.), Hall. 



(rr) 



8. 



Strqpheodonta demissa (Con.), Hall. 



(rr) 



9. 



Sftropheodonta concava, Hall. 



(rr) 



10. 



tStrophalosia trumcata Hall ((). 



(r) 



11. 



Chonetes seiigera, Hall (0. 



(rr) 



12. 



Modiomorpha concenirica (Con.), Hall. 



(rr) 



13. 



Modiomorpha mytiloides (Con.), Hall. 



(rr) 



14. 



Modiommpha mbdlata (Con.), Hall. 



(r) 



1 American Journal of Science, Third Series, Vol. XLVI, pp. 218-222. 



-' Thirteenth Annual Report State Geologist [New York] for the year 1893, p. 553. 



3 The system of numbering used in this paper is as follows : To the general region about some village, which may be used as 

 a center of operations, is assigned a number which is called the station number, as XVIII is the station number for Smyrna. 

 Then the various sections receive a letter, different strata or >w>nes of which are indicated by primes 



4 The relative abundance of the species is indicated as follows : aa - very abundant ; a abundant ; cc = very common ; 

 C= common ; rr = very rare ; r = rare. 



* 



