Vol. 58.) § PERMIAN, AND TRIASSIC OF THE ISLE OF MAN. 655 
Depth. Thickness. 
Feet inches. Feet inches. 
Rock-saut (18) with about 50 per cent. 
Oulmpniat less fad t, «sce eae eee ee 827 6 2a oO 
Brown and blue mar], with veins of gypsum. 831 10 + + 
Rocx-satt (19) with about 50 per cent, 
Gy ies rusta eee ices. 5s hla ieee a et reks 833 if 1 9 
Brown and blue marl, with saLtT and veins of 
PAVAISUUENE PY caro cues cre tian spo caean ome Cne ene 639) 11 2 4 
IROGK=SAET (20)e x sees oc sanass tees tance ere 837 8 1 5) 
Brown and blue marl, with sauT r and beds and 
MOMMSHOL PY SUI. . cn si teens oes nated ate eee 842 0 4 4 
Bottom of 8-inch borehole ............... 842 0 
Commenced with 5-inch borehole...... 842 0 
Brown and blue marl, with sant and beds and 
EMIS: Ole CYPSMMe-. ccetases in oemiene tener aol 854 2 12 2 
PROCK-SIME TS (2i)'s cxt-c5h. 6 vei totan oe. keuae voeraneniines 859 8 5) 6 
BLOW Wa El Welt. SADT ise cha. oko deuneedeceaeeess 864 2 + 6 
Soft brown and blue mar!, with saur and 
Ry OSUNAN es 282 08 Sena en enhtls Sle wns ue aa 877 8 18 6 
Soft brown sandy marl, with gypsum ......... 903 0 25 4 
Soft brown marly sandstone ...............+-.66+ 904 0 1 0 
Brow SAM GYAMIATIG 2... ci 06 ie atae'cdasn< sueieiaes 916 4 12 4 
Soft brown marly sandstone .................. Be ly) 8 3 4 
Soft brown and grey sandstone.................. 921 2 1 G 
Sluis erey-SaMAShONG \..'c6. ces. 2a aasvenekioaoe 922 4 ] 2 
922 .4 922 4 
VIII. Tar Manx Sattrierp. 
The total thickness of pure rock-salt in this borehole is 
76 feet 8 inches; of rock-salt containing 20 per cent. of marl, 
10 feet 4 inches; of that containing 25 per cent. of marl, 2 feet; and 
of that containing 50 per cent. of marl, 8 feet 3 inches. To these 
must be added marl containing about 30 per cent. of salt, 114 feet. 
The discovery of salt in these two boreholes is likely to be of 
great commercial value to the island, and is a fitting reward to 
Messrs. Craine for their persistence in carrying out the boring in 
search of coal. Looking at the evidence of the other boreholes, I 
could not advise them to sink deeper, on the chance of striking the 
Coal-Measures of Whitehaven. These, if they exist at all at this 
spot, lie buried beneath an unknown thickness of Triassic marls, 
and not less than 800 feet of Triassic sandstone, and with the 
additional chance of the occurrence of Permian strata. It is very 
probable that the Yoredale rocks, and not the Coal-Measures, form 
thé floor, upon which the newer Red Rocks have been deposited in 
this area. 
The unexpected presence of the Saliferous Marls is a link 
uniting the Triassic strata of the north of the island with those of 
Barrow on the one hand, and Carrickfergus on the other. It is 
very probable that these three saltfields belong to one great 
saliferous basin, underlying the Irish Sea, extending southward 
and eastward to join that of Fleetwood, and to the south in the 
direction of the great saltfield of Cheshire. It is now divided from 
