378 r ;H. S. WILLIAMS — CORRELATION PROBLEMS 



During the past year Mr. E. S. Bastin has been preparing the maps 

 for the folio and I have been at work on the fossils. The folio is now 

 ready for publication. In the paper above referred to I designated the 

 several faunas by numbers. Names have now been agreed on for the 

 several formations from which the faunas were derived to be used in the 

 folio as follows: 



Fauna number I is from the Quoddy shale of the folio. (Bottom.) 



Fauna number II is from the Dennys formation. 



Fauna number III is from the Edmunds formation. 



Fauna number IV is from the Pembroke formation. 



Fauna number V is from the Eastport formation. 



Fauna number VI is from the. Perry formation (already named by 

 Smith and White). (Top.) 



Briefly stated, the first five of these formations belong to the Silurian 

 system of the New York section, 3 and the sixth (Perry formation), sepa- 

 rated by unconformity from those below, is correlated with the Catskill 

 and Chemung of the Upper Devonian. 4 



To indicate the correlations more specifically, I have prepared a chart 

 which expresses the relations I think the faunas of the Eastport quad- 

 rangle bear to the New York and English sections as classified. The 

 position of the names and the cross-lines will indicate what I regard the 

 relations to be. Thus I regard the Pembroke and Eastport to be succes- 

 sive faunas representing the English Upper Ludlow and Downtonian. 

 The Pembroke is probably not older than the Eondout, but the fauna is 

 not represented definitely in the New York section, and the Eastport is 

 certainly distinct from anything reported either in Silurian or Devonian 

 of New York. 



The Edmunds is closely related to the Dennys fauna and their order 

 of sequence is as shown on the chart. I think the Edmunds fauna repre- 

 sents the English faunas from the Wenlock shale to the Aymestry, in- 

 clusive, but shows closest affinities with the Wenlock limestone and shale. 

 It is apparently not expressed in the New York section, but its affinities 

 there are almost as close with the Cobleskill as with the Eochester ; hence 

 I think it represents the formations from the Eochester to the Cobleskill, 

 inclusive. 



The Quoddy is older than the Dennys ; it is an entirely different fauna 



3 Hartnagel : Classification of the geologic formations of the State of New York. New 

 York State Museum, Handbook 19, April, 1912, table 2. 



4 Smith and White: Geology of the Perry Basin in southeastern Maine. U. S. G 

 logical Survey, Professional Paper No. 35, 1905, p. 83. 





