CONTENTS AND ORIGIN OF THE GRAVELS AROUND HULL. 51 
principally made up of sub-angular pieces of chalk, which occurs 
in situ close by, though pebbles of Oolite, Lias, Quartzite and 
other foreign stones are to be found in fair quantities. There are 
also beds of current-bedded sand. 
In many respects the gravel on the low ground, that is in 
Prescott’s pit, bears resemblances to the upper Mill Hill bed. In 
Prescott’s, however, the principal constituent is Millepore lime- 
stone, of which there are outcrops near. The gravel is beautifully 
false-bedded. 
Neither of the two deposits I have just referred to contains 
recent marine shells nor mammalian remains, but a few bones of 
horse, ox, pig, etc., are found in the surface earth, and are of a 
much later date than the gravels. 
The gravels on the low ground and at the upper part of the 
Mill Hill section may be of the same age, and I would suggest 
were formed at the last stage of the glacial period.* This 
being so, we are in a little better position with regard to the lower 
mammaliferous portion of the Mill Hill gravel, but not much. 
Under our next head we have the Post-GLaciaL beds. These 
are of an unimportant character, comparatively speaking, and will 
therefore only be referred to very briefly. 
Among them should be placed the gravels around Hornsea 
Mere, which indicate the former extent of that sheet of water— 
gravel terraces in fact. Also the beds to be found at different 
places in the lacustrine deposits of Holderness, in every case lying 
on the boulder-clay. These are best seen in the coast sections. 
In no case does a deposit of post-glacial gravel occur of sufficient 
size to be extensively quarried. 
EXPLANATION OF PLATE 2:—/Vate 2. fig Z, is a view of the 
Burstwick gravel pit, near Ryehill, in Holderness. The face of 
the section runs roughly east and west. 
Plate 2, fig 2, is a view of the Kelsey Hill pit—now disused, 
taken from Kelsey Hill farm. 
I am indebted to Mr. Frank Hollingworth for the first photo- 
graph, and to Dr. J. Hollingworth for the second. 
* It is probable they may represent the deposits formed on the shores of a 
lake which came into existence by the damming up of the drainage into the 
Humber by the ice-sheet, and it is possible that the recently discovered 
boulders of rhomb-porphyry and augite-syenite at Brough may have drifted 
from the ice-front attached to pieces of floating ice. 
