40 
THE GEOLOGIST. 
We shall be obliged, by communi cations, and strati graphical lists of 
fossils from our readers and correspondents, to assist us in our labours in 
determining this interesting point of Whether the ordinary division into 
"white chalk with flints," and "white chalk without flints," is not merely 
a mineralogical division, and not a proper geological subdivision cha- 
racterized by distinctive organic remains, and marking out a positive zone 
in the succession of geological events and of life-forms ; or Whether a dis- 
tinguishing alteration in the organic remains of the white chalk does not 
happen so near the horizon of cessation of flint layers, that by including or 
excluding some few beds of chalk, those valuable and characteristic petrolo- 
gical features (of chalk with, or without flints) may not be made more pre- 
cisely valuable and definite than at present. S. J. Mackie. 
LowEB SiLUEiAN FossiLS AT BuiLTH. — The neighbourhood of Builth 
affords excellent specimens of many of the Lower Silurian fossils, espe- 
cially trilobites. It may be useful to inform amateur and professed geolo- 
gists that the little town of Builth contains a good practical geologist in 
the person of Mr. John Jones, gardener at Pencarrig House, who, though 
in humble circumstances, possesses a capital knowledge of the fossils of 
the district, and the localities where they may at once be found. He is 
willing at all times, so far as his duties permit, to become the pioneer of geo- 
logical visitors at Builth, and will, for a suitable consideration, forward spe- 
cimens to correspondents. Several amateurs of high standing, as well as 
professors, have availed themselves of his knowledge to the enriching of 
their collections. Within the last twelve months I have received from 
him some excellent specimens of Trilobites {Ogygia JBuchii, Ampyx 
nuclus, Trinucleus concentricus, etc.), also specimens of Didymograpsus, 
Grapiolithiis, Rastintes, etc. I make this statement that others wishing 
to have their collections of Lower Silurian remains added to, may know 
whither to look for aid. — A Leominstee Subsceibee. 
Mammalian Eemains. — In the ' Philosophical Transactions ' for 1715, 
vol. xxix., two teeth of Elephas, probably -E". antiquus, are recorded to 
have been found in the north of Ireland, at Maghery, eight miles from 
Bulturbet, in digging the foundation of a mill near the side of a small 
brook that parts the counties of Cavan and Monaghan. They were about 
4 feet underground, and about 80 yards from the brook. The bed on 
which they la}^ had been laid with ferns, and Avith that sort of rushes here 
called "sprits," with which brushes and nut-shells were intermixed. 
Under this was a stiff" blue clay, on which teeth and bones were found. 
Above this was, first, a mixture of yellow clay ; under that a fine white 
sandy clay, which was next to the bed. The bed was, for the most part, 
a foot thick, cutting like turf ; and in every layer the seed of the rush was 
as fresh as if new pulled. 
In the ' Philosophical Transactions ' for 1754, vol. xlviii., there is a 
record of several bones of an elephant found at Leysdown, in the island 
of Sheppey, by Mr. Jacob, surgeon, of Faversham. Three or four years 
before, Mr. Jacob had sent the acetabulum of an elephant, which was dis- 
covered sticking in the clay which was partly washed away from the cliff, 
about a mile eastward of the cliffs of Minster. This, with other parts — 
vertebrae, a thigh-bone 4 feet long, too rotten to be taken up entire — all 
lay below high-water mark ; and as the place soon after became his property 
by purchase, he then went, attended by some workmen, in search of more 
relics, and found a tusk 8 feet long and 12 inches in circumference in the 
middle, besides other bones within 20 feet of those first recorded. 
