230 
APPENDIX C ; STRATIFICATION OF HACKNESS HILLS 
in a late chemical anlysis of some of these soils detected clay and de- 
composed Basalt probably diluvial as in the black sand in and about 
the plantations, pebbles of jasper, porpbory, and other hard rocks 
have been found. The black sand which only skirts the better culti- 
vated land certainly cannot be considered as the soil of any bed in the 
stratification but may have been washed off the moors, for 
The Yellow Sand, corresponding with that exposed m the N.W. 
side of the Scarborough Castle hill and with the same kind of sand at 
Newton, the Rabit Warren at Lackton, and the potato land at Saw- 
don, completes the varieties comprised within the mass called Calcar- 
eous Grit. 
It is the pile of beds already enumerated which composes the 
general range of Tabular Hills as those superadded on the lower 
portions of the plane of Calcareous Grit Range parallel to the Vale of 
Pickering to Hambleton and are nowhere of great width except about 
Lockton. It is remarkable that all the following superadded beds 
composing the pile called Coralline Oolite seem gradually to thicken 
as they decline towards the low ground, so that their terminating edges 
are cunated or wedge-shaped, and therefore make no irregularities m 
the general slope of the hills toward the south or south-east. They 
preserve the same character in a curved line round the inner and lower 
portion of the plain of the Hackness hills, and on their dipping side 
in the many digitated ends of the elevated plane presented to the Hall 
valley they end with the abruptness common to escarpments. 
The first and lowest distinction in the beds of lock composing the 
thick stratum of Coralline Oolite is the Wall-stone or Grey stone, 
which in shallow quarries commonly rises in flat thin pieces for fence 
walls. Some are good roadstone. This rock reposing on the Yellow 
Sand is covered with a deepish soil, stiff and tenacious with few stones 
in it, and those generally flat and thin. It grows good ciops of oats 
and seems kindly for grass. The soil of this rock between Suffield 
and Silpho, where it is most distinguishable on the cultivated lands 
seldom occupies more than one field in breadth, it seems, however, to 
occupy a considerable portion of the cultivated ridge between Broxa 
and Hackness Head. 
The Coral Bed is a more earthy bed, reposing on the Grey stone 
only about six feet thick, containing lumps of coral and small spongites, 
&c., which distingmsh it from the coral over the limestone and which 
has been noticed before for f ornung the best land about the three villages, 
