290 
MR. PEESTWICH OX FLIXT-DIPLE3IEXTS. 
Pig. 5. Pig. 6 
ft. in. ft. in. 
c. Wliite siliceous sand and ligbt-coloured marl, mixed -nitli fine cfialk grit ; a few large 
sub-angular flints, and an occasional sandstone block ; irregular patches of flint- 
gravel ; bedding waved and contorted ; here and there layers with diagonal seams ; 
a few ochreous bands ; portions concreted. Land and freshwater shells common : 
mammalian remains •, {JUnt-imflements'i') 4 10 7 4 
d. Coarse sub-angular flint-gravel in a base of white siliceous sand with chalk grit ; 
occasionally coloured ochreous and ferruginous in irregular layers ; a few black 
layers. Some large and whole flints, and some fragments angular, especially many 
small ones. Much fine chalk debris, pebbles, and small blocks rolled but not 
rounded. Numerous sub-angular pieces and blocks, small and large, of Tertiary 
(lower Eocene) sandstone ; Tertiary flint-pebbles abimdant ; occasional specimens 
of Tertiary pudding-stone, and a few chalk {Inoceramus, Pecten, Belemnites, 
Pchini, Foraminifera, &c.) and Tertiary fossils {Venericardia jplanicosta, Fummu- 
lites and other Foraminifera'), are dispersed through this gravel. Subordinate 
seams of sand. Bedding in places level and in other places contorted, especially the 
upper surface. Mammalian remains wA flint-implements dispersed throughout, 
but chiefly in the lower part. Shells, mostly in fragments {Helix, Limneus, 
Pisidium, Pupa), in some of the seams of interstratified sand* * 5 0 6 0 
22 S 19 
Section at St. Acheul ; side of thefleld 
adjoining the Monastery. 
The blocks of sandstone are very numerous and large, especially in the pits nearest the 
high road, some measuring as much as 3 to 4 feet in length, and weighing 4 to 1 ton f . 
In the east of the field the sand c thins out, and is 
replaced by the gravel as shown in section fig. 7, 
where a good many remains of the Elephant have 
been found, and but few fiint-implements. The beds 
here and throughout the field, although varying in 
thickness, have the same general composition as 
described in figs. 5 and 6. is a local sand seam.) 
One chief object in visiting the pits was to discover 
for myself, if possible, fiint-implements in situ, or, 
failing in that, to be able to certify to their discovery 
N.W. Pig. 7. S.E. 
4 
V 
/ 
* In this gravel there are also found some small round wliite 
bodies, many with a hole throngh them. They were noticed by 
Dr. Eigollot {op. cit. p. 16), who suggested that they might be d- 
beads made of hard chalk. They are not rare. I doubt, how- 
ever, their being in any way artificial, for their glohnlar form is 
natural, they being a common chalk fossil, the Coscinopora glo- ^ 
Inilaris, D’Orb. This is a small globular sponge or foraniinifer, 
of which the top is often more or less open or perforated. They are abundant on many pai-ts of our chalk 
coast, especially at Newhaven, where I have found them on tlie shore, some whole and some perforated, 
precisely like those in the gravel of St. Achenl (now the Orhitolina concava of Paekek and JoxES, 1S60). 
t There was one found which, judging from the nnmber of door-steps (about IS) imd paving stones 
(about 100) it furnished, must have weighed 4 or 5 tons. 
J In one pit, nearly in the centre of the field, the sand was 16 feet thick, and the gravel almost wanting- 
