Vol. 58. | THE SUFFOLK CHALKY BOULDER-CLAY. 183. 
supposed, as no Chalky Boulder-Clay exists in North-eastern Norfolk, 
that is, in the region lying between Norwich and the Cromer and 
Happisburgh coast. It comes on suddenly to the south of Norwich, 
and extends in an unbroken sheet to the brow of the Thames Valley. 
There is a marked difference in the erratics of the Lower Glacial 
Beds to the north of Norwich, which are mostly of crystalline 
rocks, and those of the Boulder-Clay south of that city, in which 
hard Chalk from the Wolds and Kimeridge Clay preponderate. 
His view was that an ice-stream, which he suggested might be 
called ‘the great eastern glacier,’ travelled towards East Anglia from 
Lincolnshire, keeping to the west of the Wolds, and spread itself 
out like a fan asit reached the lower ground. As the Glacial Period 
passed away, the glacier still kept to its original course, but was 
confined to the valleys, as those of the Yare and the Waveney, 
which had the same alignment as that of the supposed ice-flow. 
His friend, Mr. J. Lomas, had been for some time engaged in the 
microscopical examination of the matrix of the Boulder-Clay, and his. 
investigations, together with those of the Author, would, the speaker 
believed, lead to important results. He was inclined to think that 
Kastern England stood at this period at a higher level than now. 
Mr. H. B. Woopwarp thought that the materials of the Chalky 
Boulder-Clay might have been derived from the north-west and 
north rather than from the west, as we had to account for fragments 
of Red Chalk. Certain crystalline rocks might have been derived 
from the earlier Boulder-Clay of the Cromer coast. In considering 
the source of the materials, the question of the distribution of the 
Chalky Boulder-Clay should not be neglected: and in Buckingham- 
shire and Hertfordshire we approached the margin of the deposit, 
where Boulder-Clay was intercalated among coarse gravels, Carbon- 
aceous fragments were common in the Drifts of East Anglia, and 
might have been derived from the Estuarine Beds of Yorkshire. 
Mr. A. EK. Satter said he was glad to hear that the evidence 
brought forward by the Author was in accord with that of the 
gravel-deposits of Suffolk, etc., and pointed in a westerly direction 
for the source of the Glacial deposits in that area. The broad 
Waveney gap pointed to former fluviatile connection with the Mid-. 
land district, where Liassic strata reached 800 feet above Ordnance 
datum even now, after a long period of subaérial denudation. In 
his opinion Glacial geologists, who wished to explain the origin of 
East Anglian Boulder-Clays, would be forced sooner or later to 
consider seriously the following points :— 
(1) The denudation of the Midlands which has brought about the formation 
of the Oolitic and Cretaceous escarpments ; 
(2) The possibility of long-continued earth-movements of a differential 
character over wide areas ; 
(3) The fact that the Lower Cretaceous strata of the Midlands contain far- 
travelled boulders; and 
(4) That the present outline of the North Sea is quite different from what it 
was when the Boulder-Clays were deposited. 
Mr. Lamptuen acknowledged himself unable to adopt the attitude 
of the Author in discussing these Glacial questions. He urged that 
