DE RANGE : BORINGS FOR WATER AND SALT IN COUNTY YORK. 429 
The East Coast Saliferous Beds have invariably a bed of Anhy- 
drite as the top, which overiies the "rotten marl" resting on the 
Rock-salt, beneath wliich is the Lower Anhydrite Bed, averaging 
30 feet in thickness, but abnormally thickening to 267 feet at Hartle- 
pool. The Anh3^drite is interbedded, and passes horizontally into 
the Magnesian Limestone, and the strata from the Upper Anhydrite 
Bed downwards closely correspond to the Permian Zechstein Beds of 
Germany, containing Rock-salt associated with Anhydrite. 
It was expected that the base of the Lias would have been found 
beneath the drift, but tlie boring commenced west of the outcrop, so 
that the maximum thickness of the Keuper Marls on tke East Coast 
is not yet absolutely ascertained. On the West Coast they have 
been proved to be 900 feet in thickness, and as the Rock-salt occurs 
in the upper 320, it is possible that Triassic Rock-salt underlies the 
Lias of East Yorkshire, and looking to the maintenance of the thick- 
ness of the Rock-salt at the Lackington boring, it is possible that 
Rock-salt beds occur in North-East Yorkshire of two distinct 
geological ages. 
The following are tlie details of the Lackenby boring : — 
Ft. In. 
Ft. 
In. 
13 0 
Clay and Gravel 
... 13 
0 
24 0 
Hard Red Clay (Gypsum) 
... 18 
8 
87 0 
Red Marl and thin rock 
... 62 
4 
246 8 
Red Marl and band of blue 
... 159 
8 
255 0 
Ver}^ Hard Rock 
... 8 
4 
343 0 
Blue and Red Mari 
... 88 
4 
373 0 
Dark Red Marl, blue stone ... 
... 30 
0 
380 0 
Hard Blue Stone 
... 7 
0 
597 0 
Red Marl 
... 207 
0 
1195 0 
Red Sandstone 
... 598 
0 
1272 0 
Red :\Iarl 
77 
0 
1643 0 
Red Marl and Sandstone (63) beds 
... 371 
0 
1663 3 
Hard White Rock {Anhydrite) 
... 20 
0 
1672 0 
Honeycomb Rock 
... 9 
0 
1685 0 
Salt and Marl mixed 
... 13 
0 
1804 0 
Clear Salt Rock 
... 119 
0 
1806 0 
White Rock {Anhydrite) ... 
2 
O(-f) 
