140 
Records of the Geological Siirveg of India. 
[voi.. xin. 
After fitting and erecting tlie crane, the works were carried on under the supervision and 
with the assistance of the Department of Roads and Bridges. First of all, a small well 1'80 
meti’e deep was dug in the centre of the basin, at the bottom of which boring was begun on 
the 30th October 1878, commencing with tubes of a diameter of ’26 of a metre. The work 
which on this date has reached 79ni. 62c. in depth has passed through the following series of 
geological strata:— 
Table of Geological Strata of the Artesian Well bored m the Jariin d’Acclimatation at 
Tondicherry. 
Kumber of 
Strata. 
Dates. 
Geological Strata, 
Thicknesses 
of Strata. 
Progressive 
Depths. 
Rbmabks. 
M. 
M. 
0 1 
30th October 1878 
Natural earth 
1-33 
1-33 
1 
30tli ,, j, 
Sand mixed with yellowish clay 
0-75 
208 
(m. 2-80) water-level of 
2 i 
30tli ,j n 
Clay mixed with clear gray sand 
0-85 
2-93 
surrounding wells. 
(3‘60) mean sea-leveh 
3 
31st October and 
2iidNov. 1878. 
Clear gray sandy clay 
1-40 
4-33 
4 
4th November 1878 
Coarse bluish sand mixed with 
small gravel. 
0-30 
4-63 
b 
5th, 6th, 7th, 8th, 
9th, and 11th 
November 1878. 
Flue, clear gray sand, very fluid 
1-37 
6-00 
6 
12th November 1878 
Bluish gray sand mixed with 
small gravel. 
0T5 
616 
7 
12th and 13th Nov. 
1878. 
Coarse clear gray sand 
025 
6-40 
8 
13th November 1878 
Coarse bluish sand mixed with 
small gravel. 
030 
6-70 
9 
iStli ft jf 
1 
Coarse bluish sand, small gravel, 
fragments of charcoal and 
dec.ayed wood. 
0-35 
7-05 
10 
14th 
Coarse bluish sand, lumps of 
plastic black clay and decayed 
wood. 
0-36 
7-40 
11 
14th „ „ 
Very fine bluish sand 
0'15 
7-56 
12 
14^11 fj ij 
Coarse blackish sand mixed with 
black clay. 
0-60 
815 
(10*24) first rise of 
13 
15tli ]( 
Black clay and fine sand 
2-69 
10-74 
water-level. 
14 
15tli ft )] 
Fine sand and diluted black clay 
0-88 
11-62 
15 
ISth, 16th Nov. 1876 
Coarse sand with a little clay 
and small gravel. 
040 
12-02 
