BEEKMANTOWN AND CHAZY FORRIATIONS OF CHAMPLAIN BASIN 513 



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



NAME OP SPECIES 



60 (Orthoceras) missisquoi Bill 



61 (O.) ca.io Bill 



62 (O.) cataline ^/// 



63 (O.) sa.y\ Bill 



64 (O.) xtrxt^ Pill 



6s (O. ) tityrus Bill 



66 (O. ) aristides Bill \ 



67 (Cyrtoceras) beekmanense U'hi'if. 



68 (C.) confertissimum »7/?Vy. 



69 (C.) acinacellum U'hit/.. , ,[',',[[[[ 



70 (Lituites) imperator Bill.'.'.'.'.'.'.'.'.'. 



71 (Nautilus) pomponius Bill. , .'. . .'.",", 



BEEK- 

 MAN- 

 TOWN 

 STAGE 



CHAZY STAGE 



OTHER LOCALITIES 



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 = UticH 



NAME OF GENUS 



•< 



ca 



u 

 < 



° < 

 w 



- 0- 



S K Z 



X w ;? 



OHM 



< 



u 



z 

 < 



< 



a 

 z 



< 

 J 



gs 



< 

 t a 



& 



Z 



< 



a 



< 



J 



0. 



X 

 u 



< 



2 

 < 



NOTES 



Nanno 



Suecoceras 













Ch 



B 



Ch 

 B, Ch 



B 



Ji 

 B, Ch 



B 



Ch 



Ch 



B 



B 



L 



' L,' Bl ' 

 B 



b/bi" T 



■■■bV 

 bY?t',u 



Philipsburg 

 Also China 



Gonioceras 









Piloceras 







B 



B 



Conoceras ...... 



* 



* 



B, Levis channel 

 Also B of Virginia 

 Also B of Virginia 



Eurystomites . . 





B 

 B 



B 

 B 

 Ch 



Tarphyceras 



* ? 







Aphetoreras 







Deltoceras. . . . 











Barrandeoceras. . 

 Schroederoceras . 



* 



* 







Trocholites 



Litoceras 



y 



*(Bala) 



" ' B ' " " 





Trocholiloceras. 









B 



Ch 







Plectoceras 









Ch, Bl 

 B 



E.xtends to Niagaran of Mis- 

 sissippian sea 



I'ituitidae 



** 























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 polyphyletic groups as Orthoceras, Cyrtoceras, Gyroceras 

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



