BEEKMANTOWN AND CHAZY FORMATIONS OF CHAMPLAIN BASIN 513 



SYNOPTIC TABLE OF THE DISTRIBUTION OF THE CEPHALOPODA-(««f/«^) 



NAME OF SPECIES 



BEEK- 

 MAN- 

 TOWN 

 STAGE 



CHAZY STAGE 



OTHER LOCALITIES 



A 



B 



C 



60 (Orthoceras) missisquoi Bill 



P 

 P 

 P 

 P 

 P 

 P 

 P 



B 

 F 

 F 

 P 



P 























<5 3 (O.) szyi Bill 



1 





€4 (O.) xerxes Bill 







65 (O.) tityrus Bill 







66 (O.) aristides Bill 







67 (Cyrtoceras) beekmanense Whit/.,.. 



68 (C.) confertissimum Whit/. 









6g (C.) acinacellum Whit/. 

































SYNOPTIC TABLE OF THE DISTRIBUTION OF SOME OF THE GENERA 



Heavy print means present in greater number of species. * Present, B = Beek- 

 mantown, Ch = Chazy, L = Lowville, Bl = Black river, T = Trenton, U = Utica 



NAME OK GENUS 



BALTIC BASIN 



BOHEMIAN MEDI- 

 TERRANEAN 

 BASIN 



ATLANTIC BASIN 



NEWFOUNDLAND 

 BASIN 



CHAMPLAIN BASIN 



< 



K 



Z 

 < 



x 

 a. 



(A 



ts> 



$ 



NOTES 



Nanno 











Ch 



L 







* 









B 





Philipsburg 

 Also China 













Ch 



L, Bl 

 B 



Piloceras 







B 



B 



B, Ch 

 B 





* 





B, Levis channel 

 Also B of Virginia 

 Also B of Virginia 



Eurystomites 









B 



15 



B, Bl, T 



Tarphyceras 



* ? 







B 



B, Ch 



Aphetoceras 









B 



B 





Deltoceras 









B 



Ch 







Barrandeoceras 





* 





Ch 



Ch 



Bl 





Schroederoceras . 



* 







B 





Trocholites 



* 



■■•>•••• 



*(Bala) 





B 



B1?T,U 





Litoceras 







B 







Trocholitoceras 









B 







Plectoceras 









Ch, Bl 

 B 



Ch 





Extends to Niagaran of Mis 

 sissippian sea 



Lituitidae 



** 























RELATIONS OF THE CEPHALOPOD FAUNAS OF THE BEEKMANTOWN AND 

 CHAZY FORMATIONS OF THE CHAMPLAIN BASIN TO THE FAUNAS OF 

 OTHER REGIONS 



The elucidation of the phylogenetic relations of the Cephalopoda 

 by Hyatt and the resulting erection and precise determination of 

 numerous genera of small compass have made this important class of 

 fossils exquisitely adapted to furnish important data bearing on the 

 paleogeography of the Siluric era, which could not be hoped for as 

 long as the majority of these organisms were associated under such 

 loose and polvphyletic groups as Orthoceras, Cyrtoceras, Gyroceras 

 and Nautilus. We present here a few such data which can be de- 



