SPIRIT OF GOOD BOOKS. 
319 
J, opposite side of the road to the other pit, a well was dug through twenty- 
t. five feet of gravel and sand, but no exact particulars of it were kept. A few 
ii yards beyond this the gravel passes under tlie great mass of silt and peat 
T filling the valley of the Somme. In the other direction {i. e., up the hill), the 
e chalk comes to the sui-face at the distance of a few yards beyond an(J above 
I the pits ; but whether it forms a cliff against which the pleistocene beds abut, 
f or whether it passes by a rapid slope under them, there is no evidence to show. 
. " No organic remains have been found in the upper clay and rubble, 6 b; 
f The loam c contains a few mammalian remains. The only specimens, however, 
r collected at present are teeth of horse and bones of ruminants and of Ele- 
phants, all much decomposed. Some flint implements are recorded from th 
I Ded, and shells of Clausilia nigricans, Helix orbustomm, Helix Uspida, and 
'Pupa muscorum. Of these the Helix and Pupa are common, and the Clausilia 
very rare. 
" To the sands and gravels d and e, which may be considered as one bed, 
the greatest interest attaches, on account of the flint implements found in 
them, and the abundance of mammalian remains, land, freshwater, and marine 
shells. The bones mostly occur in or on the seam of flint-gravel e : they are 
often entire, but the bulk are in fragments. The land and freshwater shells 
are most abundant in the sand d ; while the marine shells are more common in 
the gravel <?, although a few are scattered through d. 
" Returning back through Abbeville, and ascending the gently sloping 
ground on the east of the town, Moulin Quignon is shortly reached, where, at 
a height of a hundred and six feet above t"ie mean level of the sea at St. Valery, 
is a bed of gravel showing this section. 
Pig. 4.— Gravel-pit adjoining the Moulin Quignon, near Abbeville. 
^' Amiens— Ox^ the verge of the hills, and at a distance of three-fourths of 
a mile south-east from the railway-station, are situated the very interesting and 
extensive pits of St. Acheul. According to the measurements of M. Pinsard, 
the mean height of the ground here is a hundred and forty -nine feet above the 
mean tide level at St. Yalery, and eighty -nine feet above the Somme valley, 
towards which it slightly inclines, till, as it approaches the valley, the ground 
falls by a more rapid and sudden slope, while southward it stretches with a 
gently uiidulating and gradually rising surface for many miles. The site of 
the pits is not, however, commanded by any immediate high gronnd, but, on 
