366 



ANNUAL REPORT SMITHSONIAN INSTITUTION, 1917. 



those of the Britisli Isles must be based, and the further evidence 

 of a more general character which throws light upon the correla- 

 tions. It remains now only to consider the nomenclature to be 

 adopted. 



For the glacial periods the names of Penck and Bruckner (loc. 

 cit.) seem best adapted, for although preceded in point of time by 

 J. Geikie's nomenclature, they are more definite and more widely em- 

 ployed. It is often difficult to say to which horizon Geikie's name 

 would apply, as he included under the same term beds belonging to 

 different stages. 



For the interglacials the question is more difficult, as Penck and 

 Bruckner have given no definite names, and it seems convenient such 

 should be found ; I am therefore adopting Geikie's interglacial names 

 applied to the equivalents of the Britisli stages which he included 

 under them, except to the well-marked Chellean interglacial. For 

 the postglacial stages, A. Blytt's succession (149), seems too detailed 

 and in part problematical, and the widely recognized and definite 

 Baltic stages seem the best to adopt. The scheme for Europe ac- 

 cordingly becomes: 



