120 
MR. F. W. HARMER ON THE GLACIAL DEPOSITS 
and especially at the interesting sections south of Beccles, 
before mentioned. 
The evidence of the Neocomian erratics already alluded to 
as to the movement of the ice is important. They are 
of sandstone, often fossiliferous, with glauconite grains and 
small phosphatic nodules, showing a peculiar lustre when 
broken, which makes their identification easy. They are 
found in Lincolnshire, and are exceedingly common in west 
Norfolk, whence I have traced them in a continuous trail 
towards the south-east into central Suffolk. Some of them 
are of great size, the well-known example at Merton, near 
Watton, measuring 12 feet in length by 8 feet in breadth. 
Imbedded in boulder-clay and still retaining its original 
position, its longest diameter points N.W. — S.E., an indication, 
it is believed, of the direction in which the ice was carrying 
it. That these erratics are not found to the west of the 
Fenland is interesting, confirming the view here taken as to 
the south-easterly movement of the ice. 
The frequent presence of Lincolnshire limestone, unknown 
in the North Sea Drift, and of Carboniferous detritus in the 
East Anglian boulder-clay points to an ice drift from the 
north-west across the Lincoln ridge, while the great trail of 
large masses of marlstone which has been traced southwards 
from Grantham (see contour map), and the facts observed by 
Mr. H. B. Woodward during the construction of the railway 
from Bourn to Melton Mowbray,* indicate that the travel 
of the ice in that region during the Chalky boulder-clay stage 
was from north to south or south-east, and not from east to 
west. Such facts, inconsistent with the view of an ice drift 
from the North Sea through the Wash Gap at this stage, 
support the view before stated, that the Fenland, filled with 
ice from the north-north-west, was the centre from which the 
Chalky boulder-clay was distributed over East Anglia, to the 
south-east, the south, and the south-west. f In connection 
* As to this see Geol. Mag. (1897), p. 486; and Quart. Journ. Geol. 
Soc., vol. lxiii (1907), p. 492. 
+ Geol. Mag. (1904), p. 509. 
