PART 
: on the Artesian Wells at Pondicherry. 
125 
ClavoT autl saiuiv tentative grouping of the beds gives the following 
ifrroupilig of the boiis. succession :— 
Feet. 
Feet. 
Siiperncial soil 
4-33 
4-33 
A.—Clavov . 
9 S4 
14-17 
B.—Alternating coarse sands ........ 
12-52 
26-79 
C.—Black clac and dne sand ......... 
S'S2 
35 61 
D.* Clavee sands ........... 
419 
3980 
E.—Sands withont anv clav ......... 
1239 
52-19 
F.—Black clavs. sometimes sandv ....... 
3706 
S9-25 
G.—Alternating sands and clavs ........ 
IISO 
101 05 
H.—.Alternating sandv clavs and sands ....... 
S'52 
109-57 
I.—Thick beds of black clav ......... 
15795 
J.—Fine earthv and clavev sands ........ 
2181 
179-76 
K -—Beds of coarse saud witL some ferrugiuous mattor . . . , 
1771 
197-47 
L.—TT'kite sands, clavev and conglomeratic ...... 
19'4S 
216-95 
AI.— Sands with seams of ferrnginons grit ...... 
17-90 
234-85 
if.—Fine sands ........... 
6SS 
241-73 
0.—Sands, gravelly and ferruginous ....... 
19-41 
261-14 
On comparing this succession with that of the Savana well, there does not 
appear to Ije very much in common at first sight, except 
SavaMgTOTpiiJ'*^ ^ same depth in each, there is then the 
same number of groups. This, however, goes for nothing' j 
but on looking at the groups of beds there does appear to be some faint connexion. 
In the Savana section, there are four distinct seams of clay, viz., B, D, F, and 
H, while in this section there are only F and I. B, in the first, is of about the 
same thickness as the upper clay in the Garden section, which is, however, at a 
depth of o2T9 feet. A very slight dip to the eastward, which is not an unlikely 
supposition, would allow of these being the same bed. The clay scam, I, in the 
Garden well is 48’38 feet in thickness ; but its upper surface is very nearly at 
the same depth below F as D in the Savana well is below B. There the corre¬ 
lation would seem to cease, for we can hardly suppose the 19'68 feet seam (D) of 
the Savana to have thickened out so tremendously. Xo other decided clay seams 
are found in the Garden boring, as if F and H in the Savans might also have 
