258 GILLIGAX : ALLUVIAL DEPOSITS AT AVOODLESFORD, ETO. 
ft. ?■?/. 
Surface soil . . . . . . , . . . . . 1 0 
Brown laminated clay . . . . . . . . . . 3 8 
So nd and loam . . . . . . . . . . 7 0 
Blue laminated clay . . . . . . . . . . 4 6 
Sand (sharp) 3 10 
Sand (dark; 0 4 
Sand (running) . .. .. .. .. 11 10 
Marl; clay and boulders . . . . . . . . 1 0 
The Sand at the bottom, called running sand," carried vast 
quantities of water, and gave great trouble in the sinking operations. 
A typical section was that which was exposed in excavating the 
alluvium to build No. 3 Engine House : — 
Suiface soil . . . . . . . . . , . , 1 
Brown laminated clay 
Sand and loam . . 
Strong, slaty brown laminated clay 
Gravel 
Sand 
Black sand with manganese dioxide 
Total depth of foundations 
in. 
2 
0 
9 
10 
23 
The following was the succession of the beds in the excavations 
made to the north-west oi the shafts to obtain material for the em- 
bankments : 
ft. in. 
Surface soil and poor clay with pebbles . . . . 3 0 
Brown finely laminated clay . . . . . . . . 2 0 
Gravel with large pebbles . . . . . . . . 0 6 
Fine yellow sand (current bedded) . . . . . . 2 0 
Gravel (coarse) . . . . . . . . . . . . 1 6 
Fine clayey sand . . . . . . . . . . 1 0 
Banded sand . . . . . . . . . . . . 2 6 
12 
