396 STATHER : MILLEPORE OOLITE NEAR SOUTH CAVE. 
Lias shales, and that the thin Lower Estuarine Clays and sands which 
usually underlie the Millepore'' appear to be absent at this point. 
The Lias shales were well seen in a large trial hole, twelve feet below 
the floor of the quarry, and the following fossils were collected from 
them : — Protocardia truncata (J. de C. Sow.), Pholodomya cf. ambigua 
J. Sow., Pleuromya costata ? Y. and B., Ceromya i 
The displacements in the lower part of the section appear to be 
quite independent of the curious complications in the higher part 
associated with the rubble drift, and are probably of earlier date. 
The Kubble-Drift. 
The lowest drift-deposit is an irregular band, ranging up to 6 ft. 
in thickness, and consists of fragments of flint and chalk up to 
several inches in diameter, along with occasional pieces of Red Chalk 
and some larger fragments of Millepore Limestone, set in a matrix of 
gritty chalk-wash like that seen underneath the drifts in some of the 
deeper hollows of the Chalk on Flamborough Head. The band first 
made its appearance when the quarry had been cut back a few feet 
from the original face, and it is not continuous at present through the 
whole of the section. 
A few stones foreign to the district have been found in this material. 
Prof. P. F. Kendall, M.Sc, has kindly examined five of these, and 
remarks as follows : — 
No. 1. — Quartz porphyry, origin unknown. 
No. 2. — Crushed and sheared granite, origin unknown ; not 
English, but may be British. 
No. 3. — A fine grained felsite with tourmaline. 
No. 4. — Decomposed porphyrite of the Cheviot type. 
No. 5. — Red Sandstone ; might have come from Millstone Grit 
or Old Red. 
The Clay Band. 
Usually at the top of this chalky rubble-drift there are a few 
inches of dark blue or blackish clayey material of problematic origin. 
On washing this clay, it is found to contain fragments of a small 
Pentacrinus, which suggests that the material has been derived from 
* Ibid., p. 204. 
