398 WALTON : SOME NEW SECTIONS IN THE HESSLE GRAVELS. 
The Chalk does not come quite to the surface, hut is covered by 
eight to ten feet of boulder clay. It is in this locality that the 
sections mentioned by the Geological Survey were seen. 
A little further to the north is a large pit (Hearfield's Pit) 
entirely in Chalk. This is excavated to a depth of seventy to eighty 
feet On the north side of the Ferriby Road is the Old Town's Pit, 
showing from twenty to thirty feet of Chalk. In the pit marked A, 
about ten to twelve feet of Chalk can be seen. It has also been ex- 
posed where the two dots are placed on the line AB. All these 
exposures are in the Middle Chalk, and show well-marked lines of 
large flints of a rather light colour. The dip of the Chalk is a little 
to the east of south, and is only a few degrees in amount. The 
Upper Chalk without flints is entirely absent. In all the sections 
north of the railway the Chalk comes close up to the surface, being 
only covered by a thin layer of boulder clay. The upper layers of 
the Chalk are broken up by weathering into a coarse rubble, the finer 
material being near the top, and gradually becoming more massive in 
descending. The weathering generally extends to a depth of two or 
three feet, in places a little more. In the pit marked A it is checked 
rather abruptly by a thick band of flint. 
The exposures just described are, I think, sufficient to justify 
me in marking the position of the Chalk as I have done on the map. 
I must now state that to the eastward of the line which shows, I 
believe, the position of the Old Chalk Cliff, the Chalk is at least from 
thirty to sixty feet below the surface ; probably sixty feet is the most 
nearly correct. The amount and direction of the dip will not account 
for this sudden disappearance of the Chalk. Of course it might be 
said that this would indicate a line of fault, but as the existence of 
the line of cliff is known to the north of Bridlington, I cannot help 
but think that this is the Humber end of the same cliff, more 
especially as there are no other indications of any great dislocation 
in the Chalk, although local contortions and small faults do exist, but 
these are more common in the Lower Chalk. Even if it does show a 
line of fault, it might at the same time have formed the old cliff pro- 
vided that it w r as at least as old as Pliocene times. At a point along 
the line AB there is a narrow trial pit about seven to eight feet deep, 
