76 
THK GEOLOGIST. 
At all events, might it not be worth the while of geologists, as well as anti- 
quarians to have the Saint Achcul patch of ch-ift cnt through the middle to sec 
if any more conclusive evidence of its being a place of bxirial cannot be dis- 
covered. 
It is by no means uncommon to find tumuli constructed of one material — say 
earth — at the bottom, then stone over that, and again a third material — as 
gravel or sand — over all, thus artificially producing an appearance of stratifica- 
tion, such as I learn the elevation at Saint Acheul presents. The idea which I 
have seen maintained that the hatchets arc a natural production I cannot 
imagine will find many adherents. No doubt they have been chipped into form 
by art, let the means of their present position be what it may. 
In 1835 I read apaperhere in which I showed how exactly Job's description 
of the Leviathan tallies with that of the Megalosaurus, and his description of 
the Behemoth with that of the Iguanodon, and I then broached an idea that 
although the Wealden era was the flourishing period of Megalosaurian and 
Iguanodonic existence, I saw no reason why individual animals of those species 
should not have been found existing still on the earth in Job's time, though 
rapidly becoming extinct (my paper was inserted in the " London Magazine," 
for April 1835). Now, having committed myself to such an opinion as that, 
you will see I cannot be prejudiced against any theory which would make man 
and mammoths contemporaries to some extent, and therefore have not adopted 
the tumulus idea from prejudice. — I am, sir, yours truly, Tuo. Thompson, 
"Wilton, near HuU, December, 1859. 
Silurian Rocks at Abergele, &c. — Dear Sir, — I shall be much obliged 
if you or any of your readers will kindly furnish me, through the pages of the 
" Geologist," with an abstract of the late Mr. Bowman's paper on a small 
patch of Silurian rocks west of Abergele, published in the second volume of 
the " Proceedings of the Geological Society." 
And perhaps Mr. Price, of Birkenhead, who appears to be acquainted with 
the locality, wOl inform me if he knows whether the dark fossihferous shale, 
usufilly rich in Terebratulai, Chonetes, and the smaller Producti, developed at 
various points along the North Wales belt of Carboniferous limestone towards 
the top of the series, is exhibited in any of the sections in the neighbourhood 
of Llysfaen, Llanddulas, and Abergele. 
With many thanks for kind answers to former queries, dear sir, yours truly, 
David C. Davies, Oswestry. 
Ml". Bowman's remarks are given in an abstract occupying a page and a-half 
in the Proceedings of the Geological Society (vol. ii., pages 666, 667), a copy 
of which we have despatched to our correspondent. We insert his commu- 
nication for the purpose of facilitating his inquiiies by replies from Mr. Price 
and other readers. 
Slickensides in the Chalk. — Professor Ansted, in his answers to Mr. 
Price's query, No. 24, states that slickensides do not occur in the chalk. I 
must differ from that assertion, inasmuch as I know that slickensides are, at 
least of very common occurrence in the chalk of the Kentish coast between 
Deal and Folkestone, especially between Deal and Dover will the investigator 
find numerous shght faults or partings dislocating the strata to the extent of a 
foot or two, the surfaces of the opposing planes presenting all the usual cha- 
racters of orduiai-y shckensides. 1 am also well acquainted with one of consi- 
derable extent, wliich might, during the construction of the South-Eastcrn 
Eailway tunnel through the noted Shakespeare's chff, have been turned to 
practical and profitable account. An extensive slickenside -plane extended dia- 
gonally across the mouth of the tuuuel for the whole vertical height of the 
cliff, tiiere varying from one hundred and fifty to three hundred feet in height. 
Had this been taken advantage of, and the surplus chalk cleared away carefully 
