382 H. S. WILLIAMS CORRELATION PROBLEMS 



In the Kochester fauna are listed 3 transatlantic species not detected 

 in the Edmunds fauna, namely, Plectambonites transv er sails, Bpxrifer 

 sulcatus, and Spirifer radiatus, two of which do, however, appear in the 

 underlying Dennys formation of the Eastport district. 



PLACE OF THE SIGNIFICANT BRACHIOPODS OF THE EDMUNDS FAUNA IN 

 THE TYPICAL SILURIAN SECTION OF ENGLAND 



The Edmunds fauna contains 7 transatlantic species not recognized in 

 the Eochester shale, some of which are known to appear in higher forma- 

 tions of the New York section. As these 7 species are particularly sig- 

 nificant for this discussion, the following list is presented : 



Monomerella icoodtcardi Salter. Pentarrterus galeatus Dalman. 



Leptostrophia filosa Sowerby. Meristina tumida Dalman. 



Strophonella euglypha Hisinger. Wilsonia wilsoni Sowerby. 

 Strophonella funiculata McCoy. 



Eestricting our attention to these 7 significant Brachiopods of the Ed- 

 munds fauna, the question arises what is their relationship to, the trans- 

 atlantic series of formations? In making this comparison I will select 

 the standard Wenlock section of Shropshire, situated in the center of 

 England, of the faunas of which a very full, and detailed study was made 

 by Mr. George Maw, and the exact range and frequency of individuals 

 of each species of Brachiopods was listed by Davidson in his "Supple- 

 ment to British Silurian Brachiopods/' 6 . 



In that section the beds are more finely divided stratigraphically than 

 in the more familiar general section of England and Wales. The stratig- 

 raphy of the Shropshire section from above downward is as follows : 



' Feet. 



Passage beds (Linley Brook"! ") 



Ludlow series .. ^ Upper Ludlow v collectively, 1,200-1,400 



Aymestry limestone. j 



Shales over the Wenlock limestone 100 



Wenlock limestone. . . . . i 80- 90 



Upper Wenlock shales (Tickwood beds) 300- 500 



Middle Wenlock shales (Coalbrookdale beds) 100-1,200 



Lower Wenlock shales ( Build was beds) 80- 100 



Basement beds, or Build was Park beds, Lowest 



Wenlock shales 500- 600 



Upper Llandovery , 160- 1 70 



Five of the 7 Edmunds species are listed from the Wenlock limestone ; 

 the 3 (Leptostrophia filosa, Strophomena euglypha, and Strophonella 

 funiculata) rare, and 'the other 2 (Pentamerus galeatus and Meristina 





Wenlock series. < 



8 British Silurian Brachiopods, Supplement, 1882, pp. 72-74. 



