BUFFALO SOCIETY OF NATURAL SCIENCES 



17 



Geological Range of Conodont Bed Fishes Known to Occuf 



in 



Other Formations 





MID DEVONIC 



UPPER DEVONIC 



CONODONT-BED SPECIES 



o 



.2 



o 



n 



a 

 o 



■| 



c 

 o 



d 



(U 



.2 



o 



d C 



o 



o 

 "a 





M 



a 

 o 



a 



a 

 o 



a 



•a 

 c 



<A u a 



ago 



u 



a 



u 



>-< 



O 



a 



II 

 O 



>> 



d 



-a 

 < 



3 



a a 



Dinichthys magnificus 













X 



? 











Dinichthys newberryi 











X 





? 



X 



x 





Dinichthys pustulosus 









X 





Stenognathus gouldi(?) 













X 





Aspidichthys notabilis 



















X 



Holonema abbreviatum 













X 





X 







Oestophorus lilleyi 









X 

 X 

 X 

 X 







Acanthaspis (?) armata 



X 

 X 





X 

 X 















Eczematolepis fragilis 















Ptyctodus calceolus 





X 





X 



X 

 X 



X 



? 



Ptyctodus compressus 











Cladodus urbs-ludovici 

















X 





Dittodus priscus* 



















Dittodus stria tus* 





Synthetodus calvini 





Ctenacanthus wrighti 





X 



x' 



? 

















Machaeracanthus peracutus 



X 



X 

















Machseracanthus ongsevus 

















Onychodus sigmoides . 



X 



X 



X 





























* Known hitherto only from a peculiar formation, of Upper Devonic age, at Elmhurst, 111. 



3. While the Conodont fauna is clearly of marine origin, as shown 

 by the character of the rock, which is a limestone, and by the abun- 

 dance of Conodonts, now generally regarded as the teeth of annelids, 

 and hence belonging to the sea or the seashore, it is noteworthy that 

 there are some forms, e. g., dipnoan dental plates, which are generally 

 regarded as indicative of fresh-water. How can we explain this 

 seeming disparity? The answer may be found in the peculiar char- 

 acter of the formation. From the broken and abraded condition of 

 most of the remains, and from the presence of pebbles and other 

 fragmental matter, we may conclude that this band of limestone 

 was laid down close ,to shore, and that many of the remains were 

 rolled and tossed before they finally came to rest on the bottom. 

 On the authority of Dr. G. R. Wieland we may state that frag- 

 ments of fossil wood have been found in the Conodont bed, which 

 by their worn and abraded surfaces show unmistakably that they 

 had been tossed about before they had settled to the bottom. 



