HEIDELBERG MAN 
purpose we need only direct attention to three of these. 
In the deepest and oldest series of all — lower Pleistocene 
series — occurs a thick bed of clay to which M. Rutot 
attaches particular importance, and names " glaise 
moseen," indicated simply as "clay" in fig. 79. That 
stratum he regards as marking the great floods which 
followed the break-up of the second and most severe of 
the Pleistocene ice ages — the " Mindelien." The chalky 
MAGDALENIAN t 
SOLUTREAN 
AURIGNACIAN 
MOUSTERIAN 
ACHEULEAN 11 
CHELLEAN 
STREPYAN 
MESVINIAN 
MAFFLIAN 
SANDV LOAM 
FINE LOAM 
(recent LOSi'iS,} 
ACHEULEAN 1 ^^^^>^,2^^^i^^^^^ 
BEDDED SAND 
UPPER 
PLEISTOCENE 
MIDDLE 
PLEISTOCENE 
^2^ CHAL 
Fig. 79. — M. Rutot's schematic section showing the number and sequence 
of the strata in the valley deposits of Belgium. 
boulder clay of East Anglia is also looked upon as a 
product of the same glaciation. If the age ascribed to 
the Ipswich man is well founded, then his place, in 
M. Rutot's system, lies below the "glaise moseen" — 
in the oldest deposits of the Pleistocene floor of river 
valleys. 
The second of the strata in M. Rutot's section which 
demands our attention is a mixture of fine sand and clay — 
"ancient loess" or " limon gris " — a deposit which, in 
M, Rutot's opinion, was laid down during the floods 
