CORRELATION WITH THE EUROPEAN SUCCESSION 395 



others consider it as the earliest Tertiary, equivalent in age to the Thanet 

 sands. Here, as in our own succession, the difficulty lies in the correla- 

 tion of faunas of diverse facies. Into the [)lace of tliese disputed forma- 

 tions it will not he necessary to go. It is sufficient to state that the latest 

 unquestioned Cretaceous stage is the Danian and the earliest unques- 

 tioned Tertiary stage the Thanetian. 



THANETIAN ((JERNAYSIA^), EQUIVALENT TO TOR RE JON 



The Cernay conglomerates, Rilly sands, and the La Fere glauconites 

 have furnished a small fauna of mammals and reptiles, comparable in 

 facies to our Torrejon and apparently of equal age. Arctocyon, Bissacu^, 

 and Neoplagiaulax are very characteristic types closely allied or identical 

 with Torrejon genera. The remainder of the fauna affords rather inde- 

 cisive comparison with the Torrejon except for Pieuraspidoi/ieriuitt. 

 which^^ is singularly like certain isolated teeth from the Paskapoo. A 

 thorough revision of this Cemaysian fauna is very much needed, but 

 there appears to be little present prospect of it. 



Whether the Cernaysian fauna corresponds with the whole of the 

 Thanetian or only a part of it is impossible to say. 



LIST OF CERNATSIAN FAUNA 



Creodonta : 



Arctocyon primwvns 



" gervaisii ^ Close to Clwnodon sp. div. 



" dneili 

 Hywnodictis gaudryi 



Iiisectivora 



Hywnodictts gaudryi ) ,,. 



Dtssacus cm'opwus [ 



ctivora : 



Tricuspiodon ) 



Procynictis \ Possibly related to Palworyctes 



aumonieri ) 



delcssei \^^' ? Paskapoo fauna 



Orthaspidotherium 

 Pleuraspidotherium aumonieri 



Plesiadapis tricuspid ctis 



remensis ^ Possibly comparable with the small 



gervaisu » «P^^^^^ ^^ Mioclwnus 



Adapisorex gaudr^yi 



" chevilUoni 



A dapisoriculus minimus 



Protoadapis copei A doubtful primate 



Multituberculata : 



Neoplagiaulax eocwniis \ 



" marshii v Close to Ptilodus sp. div. 



" copei \ 



" Auct. Osborn's figures in his review of the Cernaysian mammalia. 



