WALTON : SOME NEW SECTIONS IN THE HESSLE GRAVELS. 405 
the clay. The rounded boulders show that they have travelled a long 
distance ; one, a porphyrite, I have shown to Mr. P. F. Kendall. He 
says, " it might be from the Cheviots or from Scandinavia ; it 
reminds me (Mr. J£endall) of some from Fredericsvaar, especially in 
the zoning of the Felspars." 
Among the boulders may be mentioned : — 
Local Flint and Chalk. Quartzites. 
Oolitic Limestone (1 piece). Chlorite Schists. 
Limestones. Mica Schist. 
Sandstones (several varieties). Gneiss. 
Granite. 
Syenite. 
Porphyrites. 
Dolerites. 
The boulders require further examination to make the account 
of them complete. 
Other Gravels at Hessle. 
At the large chalk pits, on the Humber side, a section of some 
interest is exposed. This section shows that the boulder clay lies 
directly on the Chalk, except in a few places, where there are large 
hollows in the surface of the Chalk ; these hollows are filled with 
gravel mixed with a little clay. The stones in this gravel are 
rounded by the action of water, and there are many far-travelled 
stones mixed with those of local origin, the whole being covered with 
boulder clay. It will be seen that these gravels are undoubtedly of 
glacial origin, and belong to the boulder clay above : they are quite 
different from those I have described in the other sections, and must 
not be confounded with those described by the Geological Survey in 
which mammalian bones have been found. 
The only other deposits in this district resembling the Hessle 
gravels that I have seen are found on the lower slopes of the Wolds, 
and are nothing but chalk and flint fragments washed down from the 
higher ground and are only of very local extent. An example of 
this is at Drewton Stray South Cave, where I have seen about three 
feet of chalk wash and debris, lying upon the Kelloway Sands. 
