285 
W. T. AvKLiNE, F.G.S., A. H. Greew, M.A., J. R. Daktns, M.A., J. C. 
Ward, F.G.S., and E. Russell. — " Illustrating the Geology of the 
Carboniferous Rocks North and East of Leeds, and the Permian and 
Triassic Rocks about Tadcaster." Mem. of Geol. Survey (Quar. 
Sheet 93, S.W.) Pub. 1870. 
Classify the Lower Limestone as the base of the Permian, and the 
Shales and Sandstones below this base, as members of the Carbonifer- 
ous Formation. 
C. Fox-Strangwats, F.G.S., Mem. Geol. Survey. — "The Geology 
of the County North and East of Harrogate." (Quar. Sheet 93, N.W.) 
1873. 
Several sections exhibiting the unconformability of the Magnesian 
Limestone to the Underlying Rocks are given. The Plumpton Grit is 
considered as the uppermost bed of the Third Grits. 
A. C. Ramsay, LL.D., F.R.S.— " On the Red Rocks of England of 
older date than the Trias." Quart. Jour. Geol. Soc, Vol. xxvii., 
p. 241-. 1871. 
Refers to the Yorkshire series. 
A. H. Green, >LA., F.G.S., "On the Method of Formation of the 
Permian Beds of South Yorkshire." Geol. Mag., Vol. ix., p. 99. 
1872. 
Given an inland sea, as suggested by Prof. Ramsay, without outlets, 
having tributary streams bringing water holding the salts necessary for 
the formation of the limestone in solution, and by evaporation the Per- 
mian Limestone would be deposited. Such a state of things would be 
very unfavourable to animal life, and would account for its scarcity. 
Each division of the Permian Series is treated separately, and it is sug- 
gested that the salts may have been derived from volcanic springs. The 
same source would abundantly supply the peroxide of iron, which gives 
the colour to the red beds of the formation. 
Joseph Lucas, F.G.S., of the Geological Surv^ey, " On the Permian 
Beds of Yorkshire." Geol. Mag., Vol. ix., p. 338. 1872. 
Accounts for the derivation of the Permian Limestone by the disin- 
tegration and re-deposition of the Mountain Limestone to the west ; and 
the red colour of many of the sandstones he attributes to the presence 
of oxide of iron, which, in some instances, has stained the rocks red or 
purple, and in others has not. That the Permian and Craven Anti- 
clinal were formed prior to the Permian Limestone being deposited. 
The author finds that of 15 sections, extending over a distance of thirty- 
two miles, not one exhibits purple grit immediately under the Mag- 
nesian Limestone. In one case only is the grit red, and in that instance 
there is an intermediate bed of red marl. Cites some cases in which 
red rocks are found in the Millstone Grits, far away from the Permiaa 
Limestone. 
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