SPIEIT OF GOOD BOOKS. 
321 
" TTie blocks of sandstone are very numerous and large, especially in the 
lits nearest the high road, some measuring as much as three to four feet in 
ength, and weighing half to one ton. 
Fig. 7.— Section at St. Acheul : side of the field a4joiniiig the Monastery. 
" In the east of the field the sand c thins out, and is replaced by the gravel 
d, as sho\^Ti in section fig. 7, where a good many remains of the elephant have 
been found, and but few flint implements. The beds here and throughout the 
field, although varying in thickness, have the same general composition as 
described in figs 5 and 6. {d is a local sand seam). 
" One chief object in visiting the pits was to discover foi myself, if possible, 
flint implements in, situ, or failing in that, to be able to certify to their dis- 
covery tDy the workmen. The long fresh faces of gravel afford, together with 
the digging for gravel in daily operation, ready anu convenient sections for 
observation. On my first visit, notwithstanding a careful personal search, I 
found neither bones nor worked flints. I, however, obtained a number of the 
latter from the men, some of which were dug out whilst I was there ; and in 
the overlying sand I found numerous land and freshwater shells. 
"Entire bones are comparatively rare in these pits, but fragments, more or 
less worn, are tolerably common. The greater number of the bones are soft, 
light, and friable, and without any addition to their own earthy constituents ; 
and having lost their animal matter, they mostly adhere strongly to the tongue. 
Some, however, have received an additional portion of carbonate of lime, 
whereby their weight is considerably increased. The enamel of the teeth is 
generally but little changed. Some of the fossils are more or less bleached ; 
others are coloured by the peroxide of iron present in some layers of the 
gravel." 
[Supplement to the " Geologist," No. 42] 
