70 REPORT—1862. 
tion is probably very slow, so that the mountain may have preserved its form for a 
very considerable geological period.. The existence of a peculiar flora on the upper 
portion (Pteris aquilina), and of a land-shell (Helix Huttoni) common to the slopes 
of the Himalayas and the Nilgherris, but not yet found in any portion of the plains of 
India or Burmah; seems to show that the cone-has not only been in a quiescent state, 
but also covered with vegetation, at a time when the condition of the surrounding 
country was very different from what it is at present, since it is scarcely possible 
that ferns or land-shells should cross the large area of dry and arid land intervening 
between this isolated peak and the nearest hills (60 or 80 miles at least). 
The position of this extinct cone is interesting, from the circumstance of the well- 
known great volcanic line of the Eastern Islands terminating at Banca Island (per- 
haps at Chedalia), in the Bay of Bengal. Whether in Tertiary times this volcanic 
line extended to the N. towards China is a question for future explorers of the as 
yet unknown regions of Upper Burmah, Yunan, and Thibet. 
On some Flint Implements from Amiens. By the Rev. T. G. Bonnnuy, F.G.S. 
Notes on Deep or Artesian Wells at Norwich. 
By the Rev. J. Crompron, M.A. 
The object of the paper is to put on record the facts connected with an attempt, 
by Messrs. J. J. Colman, of London and Norwich, to bore through the Challx to 
the Lower Greensand, for the purpose of obtaining water free from the impurities 
of that within the range of the Chalk of the neighbourhood. 
The operation is performed by Messrs. Mather and Platt’s machine. In the hard 
chalk the rate of penetration has been 20 to 25 feet per day for 500 feet. 
After a few feet of alluvium, the borer passed through hard chalk with flints, at 
distances of about 6 or 7 feet apart, for 700 feet, with the exception of 10 feet at 
the depth of 500 feet, where the rock was soft and of a rusty colour; thence the 
flints were thicker, viz. about 4 feet apart, to the depth of 1050 feet; then 102 feet 
were pierced of chalk, free from flints, to the upper greensand, a stratum of about 
6 feet, and next Gault for 36 feet, the whole boring being full of water to within 
16 feet of the surface. : 
In this Gault the proceeding has been unfortunately arrested by breakages of the 
rope, ae the boring-heads lying across the passage, baffling all attempts to re- 
move them. 
The strata passed through are— feet. 
TV IU ee BOS 5a divt ints. dion « stidwaa nde aye 
ard ‘chalicewith) Hinta..:s ssn ant wise ie 6 dune ent 483 
Boftithalkuiaviien. nett daenhe ves aokins 10 
eVardtchinllicncyeity -leb-vateateee exalletacntnasniend s 190 
Hard chalk, flints closer .......... ious tne 350 
Chalk without flints........ drisbinte hay b wham Drags 102 
Upper greensand .........45 it Gant eany telat gS 
Gault, not yet passed through. .........eceee8. 36 
1189 
The fossils brought up have been the ordinary species found in the Chalk, as 
Spatangus cordiformis, and Sharks’ teeth (one, that of Zamna Mantellit). From the 
Gault, Ammonites lautus, symmetricus, and fragments of Inoceramus. 
The Foraminifera in the Gault are— 
Orbulina, common. Rotalina, not uncommon. 
Lagena, rare. Polymorphina, not uncommon. 
Nodosaria, not uncommon. Textularia, common. 
Frondicularia, rare. Globigerina, common. 
Dentalina, not uncommon. Fragments of Bryozoa, occasionally. 
Entosalenia, rare. 
In the Chalk, at 500 feet depth, the Foraminifera are more sparsely distributed ; 
they consist chiefly of the two genera Globigerina and Textularia. Rotalina more rare. 
The same is the case at 110, 400, and 1000 feet in depth. 
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