316 
ME. PEESTWICH OX EUXT-IMPLE^IEXTS. 
Explaxatiox of Plates. 
PLATE X. 
A, B. Plans of the districts immediately around Abbeville and Amiens, showing the 
extent of the tlint-implement-bearing deposits, and of the recent valley-deposits. The 
topographical part is copied from the French Ordnance Maps. 
Outline map of part of the valley of the Somme, with some principal heights. 
1, 3. Theoretical sections across the valley of the Somme at AbbeATlle and Amiens, 
showing the relative position and proportion of the beds, their relation to the present 
valley, and their level above the sea. (The gravel under the peat belongs to bed Xo. 1.) 
2. Theoretical section through Abbeville parallel with the valley of the Somme. 
PLATE XI. 
Map of the district around Hoxne, showing the position and probable extent (the 
cross lines) of the flint implement-bearing deposit The ground plan copied from 
Ordnance Map. 
1. Levels of the ground from the river Waveney* to the road by the side of Hoxne 
brick-fleld. The levels of this and the following section were taken by Mr. Alger of 
Diss. 
2. Actual section across the Hoxne brick-fleld, showing the extent of the working, the 
relative position of the strata, and the relation of the deposit to the suiTounding surface. 
3. Theoretical section, showing the relation of the Hoxne deposit to the other strata 
of the district, and its conformity with the present sui'face. 
PLATES XII. to XIV. 
Specimens of the principal forms of Elint-implements : «, front riew ; h, side riew. 
''Fig. 1. St. Gilles, in ochreous gravel; depth uncertain; 
colour, — light opake yellow. 
Fig. 2. Mautort, 1847 ; in marly gravel; depth uncertain; 
colour, — dull opake white ; reverse side, flat, simple 
fracture. 
Fig. 3. Menchecourt ; in sand (marl seam) d ? ; depth 
26 feet ; outer surface decomposed to a porcelain white. 
Fig. 7. Menchecourt, 11th April, 1859 ; in gravel ^ (fig. 2) : 
depth 14 feet ; original black colour of the flint 
unaltered ; found by the author. 
* The north end of this section is cai’ried too far east on the Map. It should he direct along the road 
from B to A. 
From the neighbourhood 
of Abbeville, — 1, 2 and 3 
from the collection of^ 
M. Boucher he Perthes. 
