SECRETARY S REPORT. 
123 
We have on this side a purple clay surmounted in some cases 
by a brown clay called the Hessle Clay. Mr. Carter and Prof. 
Kendall had suggested an explanation of this which would meet 
any difficulties which are presented by Mr. Jukes-Browne's. 
The chalk of the sea floor over which the ice passed would be 
in a much sounder condition than the shattered and weathered 
condition observed on the Wolds. As it swept over the land 
surface of much shattered chalk, it gathered up enormous quanti- 
ties of chalk, and the materials it deposited on this side they 
took to be the purple clay plus the chalk. They had heard 
the suggestion that the boulder-clay on this side was the pro- 
duct of ice moving from a north-westerly direction. With that 
they could not agree at all, because of its being charged with 
chalk from the east. In Charles Street clay-pit, Louth, there 
was a brownish clay at the top, purple clay below, and gravels 
between. Mr. Stather found in his study of the boulder-clays 
of the Yorkshire coast that a definite assemblage of boulders 
characterised the upper, which had Scottish porphyrites of the 
Cheviot type. Sporadic examples of these could be found in 
the lower clay, but in the upper they were crowded. If there 
was one good character by which the Hessle Clay could be 
identified it was the assemblage of Scottish rocks. That had 
in Lincolnshire a double significance. It was above the purple 
clay, and, so far as he knew, it had not been found on the western 
side of the Wolds. At Kirmington we get something like the 
Louth succession. But at Kirmington there was a series of 
deposits with the estuarine mollusc Scrobiciilaria piperata. In 
Lincolnshire we have a pecuHar boulder- clay which does not 
appear to have been traced into the country south of the Wash ; 
and he threw out the suggestion that the Hessle Clay represents 
a more protracted glaciation of Lincolnshire than the country 
south of the Wash. Palceolithic implements were not found 
in Lincolnshire — only one was recorded at Lincoln — but further 
north there were signs of glacial action in the Neolithic period. 
It might be that the Palaeohthic period of East Anglia was 
represented in Yorkshire by the Hessle Clay. Speaking of 
Hubbard's VaUey, Prof. KendaU said it was a drainage channel 
which had been cut to such a depth that it was bound to retain 
