Burton: Lincolnshire Coast Boulders. eae © 5 
not be able to allow for.’ (As this question is one of considerable 
interest, | hope we may hear more about it from others who are 
acquainted with the subject. 
I give the above extracts in proof of these erratics not being 
brought where they are by the agency of man; but can anyone 
doubt the natural occurrence of ice-borne rocks on this coast, 
where the boulder clay, represented here by the Hessle and 
Purple clays, ‘ The newer boulder clay,’ is so much in evidence ? 
. Jukes-Brown, in Memoir 84 of the Geol. Survey, ‘ The 
Geology of part of East Lincolnshire,’ says ‘ Deposits of glacial 
age cover a large portion of the area, and underlie the whole o 
the marsh land’; and he gives many instances of wells—as at 
Saltfleet, Mablethorpe, Theddlethorpe, Sutton, and Skegness— 
in support of this. On looking, also, at the Geological Survey 
Map of the district, it will be seen that a vast area of this 
‘newer boulder clay’ lies exposed at the foot, and on the east 
side, of the wolds ; and that it is covered over, along the shore, 
nes a band of ‘ post-glacial deposits,’ described in the Survey as 
‘silt and clay,’ through which, in places, as at Thorpe near 
Sutton, at Hagnaby, Markby, Huttoft, Mumby, Willoughby, and 
elsewhere in the neighbourhood, the boulder clay stands out. 
To what height this ‘newer boulder clay,’ at one time, rose 
above the chalk beneath, may be guessed at by the cliff at 
Cleethorpes, before it was converted into gardens. Imagine this 
cliff, not merely before it was cut down, but when first deposited 
and before it had suffered denudation, continuing all down the 
land to the east of the wolds; and where has all the clay, of 
which it was composed, with its burden of erratics, gone to? 
remain scattered over the land and on the shore, forming’ no 
mean portion of the covering band of ‘ post-glacial’ clays alluded 
to above. What wonder, then, that ice-borne erratics should be 
found throughout the district, on shore and inland ? Would it 
not rather be a subject for wonder if we did not find them there ? 
Brick-pits, where sections can be studied, are plentiful in these 
‘post-glacial’ clay deposits, as a reference to the Survey Memoir 
and Map will show; and though, when the boulder clay 
beneath was scattered, the stones it contained would naturally 
get separated from their matrix, a careful search in these pits 
and in the land around, would doubtless bring many of them to 
light. 
_ Mr. Jukes-Brown, in the Survey Memoir, speaks of a brick- 
yard in these ‘post-glacial’ beds half a mile N.N.E. of 
May 1898. é ee i ” ae s 
