380 H. S. WILLIAMS — CORRELATION PROBLEMS 



of the New York standards outcropping only a few hundred miles south- 

 west of them. 



In order to avoid the vagueness which would result from an attempt 

 to cover the whole series of tlie faunas of the Eastport quadrangle, I will 

 restrict the present discussion to the details of one of the faunas — that 

 is, the Edmunds — and in giving the facts regarding the Edmunds fauna 

 I will refer only to those species which have, after an exhaustive study of 

 the whole fauna, proven to be of chief significance in solving the prob- 

 lems involved. 



In making exact correlations in this part of the geological column, as 

 paleontologists well know,~ the Brachiopods are more abundantly repre- 

 sented and more frequently met with in various parts of the world; and 

 have been more thoroughly described and illustrated than any other 

 group of organisms. Therefore, when questions of stratigraphic range 

 and geographic distribution are concerned, Brachiopods furnish at least 

 one of the most satisfactory statistics. For this reason I will here con- 

 fine attention to Brachiopods, simply stating that, so far as the evidence 

 is at hand, the conclusions reached are confirmed by the other classes of 

 invertebrates represented. 



GENERAL CORRELATION OF THE EDMUNDS FAUNA 



In correlating the fauna of the Edmunds formation I found 21 species, 

 including several classes of invertebrates, identifiable with species already 

 described in literature. Of these 18 are listed in Etheridge's British 

 Paleozoic fossils, 5 and all of them are reported from the Wenlock lime- 

 stone. All except the coral, Turbinolopsis bina Lonsdale, are recorded 

 from the Wenlock shales, and the exception is listed in each of the local 

 divisions of the Wenlock series except the Wenlock shales, and it extends 

 below as far down as the Caradoc and as far up as the Aymestry limestone 

 of the Ludlow. 



Three of these do not appear above the Wenlock limestone, namely, 

 Monomerella woodwardi, Rhynchotreta cuneata, and Rhynchonella bore- 

 alis. Below the Wenlock shales 16 appear in the Woolhope next below 

 and 14 (with one doubtful) in the Upper Llandovery, still lower, and 12 

 of them appear below the Silurian boundary in the Lower Llandovery, 

 Caradoc, and 4 as low as the Llandeilo. 



Above the Wenlock shales 12 appear in the Lower Ludlow, 11 (and 

 one doubtful) in the Aymestry, and 4 in the Upper Ludlow. The evi- 

 dence thus far seems to warrant the conclusion that the Edmunds fauna 

 is a Wenlock fauna, and is most nearly related to the fauna of the Wen- 



e R, Etheridge : Fossils of the British Islands, p. 1, Paleozoic, 1888, 





