282 
LAMPLUGH : GLACIAL SECTIONS NEAR BRIDLINGTON. 
yielded only to the drastic metliods" adopted by that indefatigable 
and experienced worker, Mr. ^Y. B. Headley, who took advantage of 
the occasion to secure three or four tons of the most promising 
material, so as to be able to deal with it at leisure. From that por- 
tion which he has already sifted, he has obtained many hundreds of 
specimens (which have been most considerately placed at my disposal 
in working out the fauna), and it is more than probable that among 
this material we shall find some species new to the list. 
The curiousty unequal distribution of the species noticed in my 
previous papers, was strikingly evident in these beds. Thus, several 
fine unbroken valves of Pentiinculus glijcimeris were taken from a 
small pocket of coarsish sand near the third break-water, and in no 
other part of the section was this shell found ; and again, while the 
large patch near the site of the old skating rink (B of section; con- 
tained a large and varied fauna, and proved the richest part of the 
deposit, there was a mass exposed on the fore-shore just opposite and 
not many yards away, composed almost entirely of large valves of 
Cyprina islandica crushed into angular fragments. 
The Boulder-clay itself also contained many shell fragments, 
Tellina halthica being the most abundant, as it generally is in the 
Boulder-clay, though this species was not found in any of the patches. 
A list of the molluscan fauna of these beds, partly compiled 
from previous work, is given in Appendix A, p. 294. Large numbers 
of Ostracoda and Foraminifera were also noticed, but have not been 
determined. They were probably of the species recorded in Reid's 
Holderness, p. 22-23, and my paper, Q. J. G. S., xl., p. 323-326. 
This tendenc)^ of the Basement Clay to include patches of other 
deposits I regard, as mentioned above, as one of its chief character- 
istics, and it is a feature which distinguishes it from the Purple Clay. 
The inclusions are not always beds of glacial age, but are sometimes 
* The method usually followed by Mr. Headley is to break up the sandy 
and clayey material into pieces aboijt the size of a walnut, detecting- in this 
stage the larger specimens, and then after thoroughly drying and baking the 
lumps in the oven to plunge them while still hot into cold water. Under this 
treatment the material falls into an impalpable mud, and may easily be passed 
through a fine-meshed sieve, so as to separate out all the smaller shells and 
shell-fragments, along with water-worn pebbles, spines of echinoderms, teeth 
of fish, and other odds and ends that gather on a sea-bottom. 
