W, H. Hohhs— Post-glacial Faulting. 509 



no evidence of the weathered or eroded dikes to which 

 Bell ascribed the rectilinear channels of this region and 

 of many other parts of Canada, and in connection with 

 w^hich he has assumed such an exceptional amount of 

 w^eathering and subsequent glacial erosion.^ 



Universitv of Michigan, 

 February 8, 1921. 



' Eobert Bell, Bull. Geol. Soc. Am., vol. 5, pp. 364-366, 1894. 



Akt. XXXIX. — A Note on the Cernaysian Mammal 

 Fauna; by W. D. Matthew. 



M. Teilhard de Chardin is the author of an admirable 

 revision of the Carnivora of the Quercy Phosphorites of 

 France. He has recently been engaged upon a revision of 

 the Cernaysian fauna, the oldest Tertiary mammals of 

 Europe, and has just published^ a brief note of his pre- 

 liminary conclusions, especially as to the correlation 

 of the fauna. The following translation of his observa- 

 tions may be of interest to American palaeontologists : 



''The revision of the Victor Lemoine collections pre- 

 served in the Paris Museum, researches in various 

 museums in France and abroad and excavations made at 

 Cernay-les-Reims, have led me to a better understanding 

 of the evolution of the Lower Eocene mammal faunas of 

 Europe. 



''1. Age of the Cernaysian Fauna. The Cernaysian 

 fauna belongs not at the base nor in the middle (as has 

 sometimes been supposed) but at the extreme summit 

 of the Paleocene. The study of the Multituberculates, 

 the OxyclaBnidse (Arctocyonides) , the Cheiromyidae {Ples- 

 iadapis tricuspidens Gerv.), etc., that it contains, shows 

 that the conglomerate of Cernay (and with it, probably, 

 all our Thanetian) correspond exactly to the 'Tiffany 

 beds' of -New Mexico, a formation intercalated between 

 the upper Torre j on and the Wasatch. Plesiadapis 

 tricuspidens, notably, may be specifically identical with 

 Nothodectes gidleyi Matthew of the Tiffany beds. The 

 Cernaysian fauna differs principally from that of the 



^ Comptes Eendus Acad. Sci."^ France, 1920, seance de 6 Dec, pp. 1161-2. 



