A, Tylor on the Amiens Gravel. 313 
the Rue de Cagny, of bare chalk facing the west. The out- 
crop of chalk is marked on the plan, in order to be well seen. 
e contrary is the case with the sections from south to 
north. The escarpment of the chalk facing the river Somme 
Fig. 5.—Section of decomposed Chalk exposed in a quarry in the escarp- 
a ment near ©, with bank of Loess at the base, ve 
SSS ANENAN CUES NU a AT SAGITTAL UA UTTAR 
REET 
pA Aas! \ ARORA ANS 
OPN pe ae gar le Hei rg a as 
RISE of SS RO in rer 
Tis Mapa ty = ively otha WIGAN e 
ms . “, - ~ tay 
zy 
fen 
Base 
= ~i72 Talus. 
Loess. Yj 
LM: 
Fig. 6.— Section showing the escarpment of Loess between the Quarry 
B= fi d W. 
(fig. 
5) and the Imperial Road. 
Quarry 
_ “aen compared with the almost perfect horizontality of the 
_ thalk in an east and west direction. 
% St-Acheul. The western escarpment of St.-Acheul is the 
idl of a valley now dry, but which evidently contained a rap- 
