CONTAINING FLINT IMPLEMENTS, AND ON THE LOESS. 
Fig. 5. — Section on the side of the valley of the Somme at Montiers. 
257 
Elephant, &c. Flint implements of the flake type not rare ; one discovered at >5 20 to 25 feet. 
d. Rude mass of coarse gravel (high-level valley-gravel) . A few fossil bones ; numerous shells 10 to 12 feet. 
1. Chalk. (The height at the railway cutting is only approximate.) 
The gravel at the new ballast-pit is much mixed with chalk debris, and is less regular 
in its structure than the gravel at St. Acheul. It contains similar boulders of sand- 
stone, and the identity of the two deposits was further confirmed by the discovery in 
the upper and more sandy part of the gravel bed of an abundance of land and fresh- 
water shells, more numerous as to individuals than at St. Acheul, but of fewer species. 
Helix concinna. 
— — pulchella. 
hispida. 
Shells from the new ballast-pit south of the railway at Montiers. 
Pupa marginata. Ancylus jluviatilis. 
Succinea elegans. Limncea palustris. 
— * — putris. truncatula. 
Pisidium fontinale. 
Planorbis spirorbis. 
Valvata piscinalis. 
I also found a few fragments of bone, but not determinable. Of flint implements I 
could discover none, nor have any been yet found by the men. In the lower pits on the 
other side of the line the gravel is spread out in great horizontal beds, or rather lenti- 
cular masses, and is interstratified with some very sandy beds ; the beds vary more in 
colour, and no shells have been found. Their thickness amounts to about 25 feet, 
whereas the higher gravel ( d ) is only about 12 to 15 feet thick. In all respects the lower 
gravel ( c ) resembles that of St. Roch. On the occasion of a former visit I had 
shown the men a flint implement from St. Acheul, and requested them to look for and 
keep any specimens. On my second visit, accompanied by Sir Charles Lyell, to whom 
I had mentioned the interest of the section, the men showed us a flint implement which 
they had just discovered at a depth of 17 feet from the surface, and at a point marked 
^ in the section*. This specimen is quite white, has dendritic markings, and is of the 
simple broad flake type common in the low-level gravel at Mautortf . On my last visit 
I obtained five more specimens, all of the narrow flake type known as flint knives, except 
* Whilst in the pit we employed a man to work at a heap of the weathered gravel. A small flint knife 
was the result of an hour’s search. f See fig. 2, Plate XII. Phil. Trans. 1860. 
2 n 2 
