CONTAINING- FLINT IMPLEMENTS, AND* ON THE LOESS. 
259 
Four miles lower down, and immediately opposite Menchecourt, are the pits of 
Mautort, described in my former paper. A bed of gravel there occurs on the slope of 
the hill at a height of 80 feet* above the river, and lower down another bed forms a 
bank on which the village stands. At a pit belonging to M. Ducastel, these lower 
gravels are very sandy and distinctly bedded, and there is good evidence for believing 
that marine shells ( Cardium edule and Littorina littorea) occur at their base. I found 
no flint implements, but Sir Charles Lyell obtained, in the gravel-pit at the further 
end of the village, two indisputable specimens of the low-level ovoid form. There is a 
patch of high-level gravel near Saigneville, whilst at the mouth of the Somme a con- 
siderable width of ochreous flint gravel caps the hills near St. Valery, at a height of 
about 100 feet above the sea. I could discover no organic remains in any of the pitsf. 
The right bank of the Somme, between Amiens and Abbeville, shows a much greater 
amount of denudation. The hills are steeper and present generally bare surfaces of 
chalk, with more or less brick-earth on their summits and flanks. 
Fig. 7 . — Section across the valley of the Somme near Amiens. 
Near Amiens I found nothing to correspond with the opposite St. Acheul high-level 
valley-gravel, except some scattered sandstone boulders at Longpre. From this point 
to Pont RemyJ, the ground requires further examination. Thence to Abbeville the 
hills, at a height of from 100 to 150 feet, are capped occasionally by flint gravel, in 
which no remains of any sort are met with until we reach the gravel-pits of St. Gilles 
and Moulin Quignon, described in my former paper. 
In all the foregoing cases the sandy and ochreous subangular flint gravel nowhere 
occurs on hills higher than about 150 feet above the level of the Somme, and flint imple- 
ments have not been found in beds more than 100 feet above that level ; these gravel beds 
range parallel to the Somme, and in no case, except at the embouchure of the river, 
extend more than half a mile from the side of the valley. 
* There was a discrepancy between my estimated height of the upper pits on the road to Moyenville, near 
Mautort, and the measurement obtained for me by M. Boucher de Perthes, for which I could not account in 
1860. A well has been since sunk adjoining the old pit (now filled up), and the water-level in the chalk 
reached at a depth of 81 feet. Allowing 5 feet for the fall to the river, the height of the ground at that spot 
would be 86 feet. 
t A raised beach containing Cardium edule has been stated to occur at the top of the hill near the old 
castle ; but after a careful search I could not find a trace of any such bed. Sir Charles Lyell came independently 
to the same conclusion. On a more recent visit there with Mr. Evans and Mr. Lubbock, we merely found 
numbers of weathered valves of recent Cardium edule &c., and fragments of pottery in a black soil — a sort of 
Kjbkkenmodding. 
+ M.be Perthes has a tooth of the Elephas primigenius from this place, but the exact position is not recorded. 
