400 
STATHER : MILLEPORE OOLITE NEAR SOUTH CAVE. 
" A very significant section is exposed at Harworth, about 8 miles 
S.E. of Doncaster. About 20 feet of clay is exposed in a brickyard. 
When seen in 1896, the clay appeared to be devoid of lamination or 
bedding, but sections now visible show both features well. On some 
faces the stratification is thrown in great rolls and minor contortions, 
often enclosing masses of stratified sand. These eyes of sand vary in 
size from an inch in diameter up to several feet. The stratification 
" may be at any angle to the horizontal, and in the larger bodies is, 
besides, being abruptly cut off at the ends. The smaller inclusions 
may be crowded together like the pebbles in a gravel, and all, whether 
large or small, have, it is suggested, been moved in a frozen condition. 
" The interpretation ofiered is that the deposit was laid down in a 
lake subject to severe freezing and drifting of floating ice, which 
contorted the deposits when it grounded. 
" There are many pebbles and boulders, chiefly of local rocks, but 
a peculiar significance attaches to the frequent occurrence of glaciated 
blocks of hard Chalk of the type found in the Wolds of Yorkshire 
and Lincolnshire, accompanied by large tabular grey flints of the 
same provenance. One specimen was found of fossiliferous oolitic 
limestone of a very distinctive type, recognised by Mr. M. Odling as 
exactly resembling a rock he has observed on the Hambledon Hills. 
The altitude at which this deposit occurs is about ICQ feet above 
sea-level." 
In conclusion, I should like to thank Prof. P. F. Kendall, M.Sc, 
and Mr. G. W. Lamplugh, F.R.S., for many helpful suggestions during 
the preparation of these notes ; and also to mention how much I am 
indebted to Mr. W. H. Crofts for obtaining detailed measurements of 
the section from time to time, and supplying the illustration on page 
398 and the map. Thanks are also due to Mr. J. T. Dyson for the 
photographs, and also to Mr. Thos. Slieppard, M.Sc, for help in the 
field and in many other ways. 
