94 



NEW YORK STATE MUSEUM 

 Frequency and vertical range of species {concluded) 





ray- 

 lime 

 stone 



Reddish 

 Kray 

 lime- 

 stone 



Black 

 liine- 

 Btone 



c 



N. Y. 



Canada 



Wett' 



Other regions 



AparohiteM minutissimus var. 















Euryrhiliiiu reticiihita Ulrich. 



r 



c 



r 

 rr 











Lo-B 

























E. Bubnuliata var. rensselaerica 







rr 







rr 

 c 

 rr 

 c 











E.sabradiataLo. 





























lioUia cornucopiao ap. nov 



MacronuteUa ulrithi *p. not'... 







































BjthocypriH uyliiidrica Hall sp. 



cc 



r 





u 



i'-U 





TAXONOMIC RELATIONS OF THE FAUNAS 



Compact black limestone 



A comparative study of the vertical ranges of these fossils 

 gives the following results for the fauna of the black compact 

 limestone pebbles (group 5). 



In this compilation of the vertical ranges, the more complete 

 data obtained by the cai-eful investigations of the western lower 

 Siluric faunas by Clarke, James, Miller, Sardeson, Schuchert, 

 Ulrich, Winchell, and others, have been largely used, as the New 

 York lower Siluric faunas, since the days of Hall's preparation 

 of the first volume, Paleontology of New York, have been practi- 

 cally left untouched, and the very important work of the exact 

 fixation of the ranges of the lower Siluric foi-rns and of the more 

 definite subdivision of the beds has only lately begun. It is 

 therefore assumed that forms which in the west or in Canada 

 have been found to reach below or above their zone in New York, 

 will with farther investigation also be found to have a wider 

 range in this state. A glance at the preceding table will show 

 that a great number of forms reported only from the Trenton of 

 New York and Canada, are claimed to occur in the Ohio and 

 upper Missifssippi basins in beds corresponding to the Ix)wville 

 and Black river limestones. This is evidently due to the rela- 

 tively poor development of these last two terranes in the east. 

 Diplograptus foliaceufi passes from the Chazy into 



