HAKMER : THE PLEISTOCENE DEPOSITS OF EAST AXGLIA. 321 
a line running in a S.E. — X.W. direction from Crefeld, by way of 
Amersfoort and the islands of Urk and Wieringhen, to Texel.* 
Such a line i^rolonged still further to the X.W. would cross the 
North Sea towards the Yorkshire or Lincolnshire coast. It 
seems more than probable, therefore, that at this period the 
southern edge of the Scandinavian ice, coalescing with that of 
the north of England and of Scotland, may have formed a solid 
barrier, effectually closing the German Ocean to the Xorth. 
M. Rutot points out that the Limon Heshayen, a deposit which 
covers with a more or less continuous sheet a considerable region 
in Belgium and the Xorth of France, stops suddenly at a point 
where it attains its greatest thicknnss, along a line roughly parallel 
to what he believes to have been the southern limit of the 
Scandinavian glacier, and at a distance from it of a few kilo- 
metres only.f These facts seem to support the view taken by 
Belt many years ago that the drainage of the Rhine and its 
affluents, then flowing, I think, in greater volume than now, at 
any rate during summer, arrested to the north by an impenetrable 
wall, formed a great ice- and land-locked lake. J The waters of 
this lake, gradually acquiring a level higher and still higher, 
might eventually have forced for themselves an outlet into the 
English Channel ; draining the lake by their escape, arresting 
the further deposition of brickearth, and reintroducing marine 
currents from the south into the Xorth Sea, they would have 
altered the character of the sediment accumulating in the Anglo - 
Belgian basin. The Lower Glacial brickearths, which from the 
coast southwards to Xorwich and beyond are unstratified, seem 
to be represented in South Xorfolk and the northern part of 
Suffolk by finely laminated clays, as at Boyland Hall, three 
miles east of Forncett Junction, Diss, Woolpit near Bury- St. 
Edmunds, and elsewhere. While therefore the former may 
indicate the morainic accumulation of the Xorth Sea ice, the 
* Le Rhin et le Glacier Scandinave Quaternaire. Bull. Soc. Beige de 
Geol. Tome xvi., p. 129, 1902. 
t Comparaison du Quaternaire de Belgique au Glaciaire de V Europe 
Centrale. Bull. Soc. Beige de Geol. Tome xiii., p. 307, 1899. 
t Nature, Vol. x., p. 25, 1874. See also Quart. Journ. of Science, 
1874, p. 440. 
