257 
BOULDERS AT BRIGG. 
F. M. BURTON, F.G.S., F.LS., 
Highfield, Gainsborough, Lincolnshire. 
THROUGH the kindness of Mr. C. L. Hett, of Springfield, Brigg, 
I had recently an opportunity of examining a bed of chalky. 
boulder clay which had been disturbed in laying down pipes to 
increase the Brigg water supply. 
This glacial drift deposit covers a considerable area of the 
land in that district and overlies the Oxford clay. he trench 
mass of chalk, gravel, and flints, mostly small, such as are 
usually found in sections of this nature; but, under a hedge on 
the side of the field in which the trench had been dug, were some 
fair-sized boulders, several of which had been placed in the ruts 
of a cart-track running by the hedge, and amongst the latter 
Were two of a crystalline nature which have been kindly 
examined by Mr. T. Sheppard, of Hull, and the details are_ 
Personally, I can give no further information about the 
boulders, nor say how they came into the ruts and places where 
I found them, but Mr. A. Atkinson, C.E., Engineer to the 
Commissioners of Ancholme Drainage and Surveyor to the 
Commissioners of Sewers, whose observations are to be relied 
on, in a letter to Mr. Hett, says: ‘The cutting at the water- 
orks was entirely through glacial drift—chalk, gravel, and — 
flints, with lenticular beds of black clay, possibly re-deposited 
xford clay. There were several bo i 
preservation, an idea that was never carried out. 
One particular boulder with the finest ice-scratches I ever found. 
It, however, split up into thick flakes under the action of frost.’ 
This boulder I did not see, but several of those remaining by 
the hedge side, and in the ruts, were plainly and deeply | scored - 
by ice; and a small clay nodule (534 x 344 x2 inches) which Mr. 
Hett had kindly taken care of for me, contains more perfect ice- 
marks than are usually found in loose boulders. It has been 
placed in the Lincoln Museum, where it can be examined by 
those who care to see it. 
this are aeons found in the Holderness boulder clays, 
y 
and are usually well scratched on the top and bottom, more — 
. barely on the sides. 
ulders, some of which I had. 
put under the hedge by the roadside with a view to future _ 
There was — 
Mr. Sheppard says that nodules like 
. 
