422 OSBORN AND REEDS PREHISTORY OF MAN IN EUROPE 



[Glaciation IV] Upper Boulder-clay [=Wurm]. — Weathered to a depth of 



only 1 to 2 meters. This glaciation nowhere overstepped 

 the limits of the preceding one, but was of considerably 

 less extent. Magdalenian culture. 



Second Interglacial [== Riss-Wtirm, 3rd Intergla- 

 cial] . — Corbicula Duboisiana. Rixdorf horizon. 

 Mousterian culture. 

 [Glaciation III] Middle Boulder-clay [Riss]. — Weathered to a depth of 10 to 



12 meters. This glaciation may have overstepped the 



limits of the preceding one at a few points. Middle 



terrace of the rivers. Mousterian culture, 



First Interglacial [== Mindel-Riss, 2nd Interglacial]. — 



Cyprina clays. Eem beds. Beds with Paludina 



diluviana, Corbicula fluminalis, Bithynia tentacu- 



luta. Acheulean culture. 



[Glaciation II] Lower Boulder-clay [=Mindel]. — Very deeply weathered. 



Ice reached its maximum extent at least in the west and 

 southwest and possibly over the whole area. Higher 

 ("chief") terrace of the rivers. 

 [Glaciation I Not recognized] 



5. NEW CHRONOLOGIC DIVISIONS PROPOSED BY DEP&RET 



Review and Summary of Deperet' s proposed chronologic Subdivision of 



the Quaternary 



We have summarized above Deperet's observations on the peri-Alpine 

 region; we may now summarize extensively his proposal of a new 

 chronologic subdivision of the Quaternary based chiefly on a theory of 

 widespread and uniform marine transgression and regression (recession) 

 in western Europe. 



Deperet's paper on the chronologic coordination of Quaternary time 

 was published in eight installments in the Comptes Bendus, the first 

 appearing March 25, 1918, and successively thereafter until the date 

 of the last, July 26, 1920 (Deperet, 1918.1-.5, 1919.1, 1920.1,.2). This 

 was followed by a short paper (1921.1) giving his conclusions. In his 

 initial paper (Deperet, 1918.1) he remarked: 



"The Quaternary or Pleistocene period, although the most recent of geologic 

 time, is still the most obscure and the least definite so far as classification is 

 concerned, in spite of certain interesting proposed syntheses, especially by 

 Boule, J. Geikie, and Penck, and more recently by Haug. This classification 

 has depended sometimes on the study of marine deposits (Stefani, de Lamothe, 

 Gignoux) ; sometimes (J. Geikie and Penck) on the series of glaciations ob- 

 served, either in the north of Europe or in the Alpine border valleys, and, 

 finally (Boule), on prehistory combined with the terrestrial Quaternary fauna 

 and glacial phenomena. None of these classifications appears (in his opinion) 



