430 DE RANCE : BORINGS FOR WATER AND SALT IN COUNTY YORK. 
The thickness of the beds beneath this boring is not known, but 
in all cases, borings that have been carried sufficiently deep between 
Middlesborough and Hartlepool, have proved the Magnesian Lime- 
stone to underlie the saliferous beds. It is worthy of note that the 
rock-salt of the east coast is invariably associated with amorphous 
sulphate of lime ivithout water of crystallization {Anhydrite), which 
in the higher beds in which the sulphate of lime with water of 
crystallization (Gypsum) occurs alone, salt is absent. 
Coatham 1567, communicated by Mr. Peacock, M.E. : — 
Ft. 
In. 
Ft. In. 
0 
X. 
Clay 
6 0 
2- 
Blue Shale 
39 0 
3. 
Nodular band 
1 6 
4. 
Blue Shale 
1 8 
CO 
5. 
Nodular band 
2 0 
^ < 
6. 
Blue Shale 
6 4 
O 
7. 
Nodular band 
1 6 
. 
8. 
Blue Shale 
... 21 0 
9. 
Bastard post (grey) ... 
5 0 
0 
10. 
Blue Shale, hard band 
33 0 
11. 
Dark Shale, Pyrites ... 
12 0 
.2 
12. 
White and grey post, biine . . . 
9 0 
13. 
Red and white mottled posts 
... 12 0 
14. 
Dark-blue Shale, hard bands 
... 19 0 
0 
15. 
White Shale 
18 0 
[ 16. 
Red Marl, Gypsum ... 
74 0 
17. 
Hard band ... 
0 2 
18. 
Red Marl 
... 23 0 
^ < 
19. 
Hard band 
0 3 
a> 
20. 
Strong Red Marl 
9 0 
21. 
Gypsum . . 
1 4 
6 
22. 
Red Marl 
0 9 
341 
Works for the manufacture of salt formerly existed on Tod 
Point, but whether from sea water or a brine spring is unknown. 
Strong brine was met with in a futile shaft sunk for coal in 1856, on 
Coatham Marsh by the late Mr. Slate, of Redcar, which led to the 
above boring being made, which however did not realize expectation. 
