244 
LAMPLUGH: GLACIAL SECTIONS. 
similar lithological character, which, from its position, appearance, and 
direction, I should say represents the high-level “ Sewerby Gravels” 
of Mr. Dakyns.* 
The distribution of this gravel is very irregular, but it is rarely 
absent from the sections which rise above the 50ft. contour line. It 
varies considerably in roughness, being, in places, full of large 
sub-angular lumps of chalk such as one might find in the bed of a 
swift stream ; whilst in others the pebbles are small, though never 
very well rounded. Speaking generally, its roughness increases 
very rapidly as we pass up the slopes on the north side of Bridling- 
ton, and decreases in the opposite direction, becoming, at the same 
time more sandy ; from which I should infer that the bare chalk 
slopes in the immediate neighbourhood have supplied the chalk con- 
tained in it. 
The eastern extension of the gravel towards Sewerby is not 
well marked till we reach the ground shown in the north-east corner 
of the ground plan ; but from this point it may be traced con- 
tinuously. There is a good section in a gravel pit behind the farm 
known as Sands House , where the gravel is very coarse and contains 
many large foreign pebbles, as well as much chalk, the former being 
no doubt derived from the erosion of the Purple Clay on which the 
gravel rests. 
Still going east we had another fine section of the gravel in 
the ballast-pit in the railway cutting near Sewerby Gate-house, but 
this is now closed and the banks sloped. The bare chalk surface is 
seen in the cutting about 500 yards further north, and the gravel 
seems to pass down from this, and overlap the feather-edge of the 
Purple Clay. The gravel here forms a well-defined ridge running 
east and west, and must be of considerable thickness. From this 
point the surface slopes gradually down to the cliff, where the 
gravels are seen in continuous section, f They may be traced along 
the headland towards Flambro’ Dykes, thinning out rapidly and 
decreasing in roughness, and finally disappearing from the cliff two 
* Mr. J. R. Dakyns, Proc. Yorks. Geol. and Polyt. Soc., 1879, p. 123, and 
1880, p. 246. 
t See Mr. J. R. Dakyns, in papers cited above. 
