STATHER : MILLEPORE OOLITE NEAR SOUTH CAVE. 
397 
the Lias occurring below the Millepore rock. Some minute tubular 
cavities in the clay are suggestive of rootlets of vegetation such as might 
indicate an old land surface, but no carbonaceous matter has been 
found, or any other proof of land conditions. The clay band is in 
some places crumpled and contorted. 
This clay-seam beneath the displaced sheet of limestone has 
apparently formed the gliding plane on which the limestone has slid. 
The Displaced Millepore Limestone. 
Immediately above the clay band, there was in October, 1920, a 
displaced sheet of Millepore Oolite — sometimes shattered, sometimes 
in long tabular bedded masses — extending to the top of the section as 
seen at present. In thickness this displaced OoUte varied from 3 feet 
to 12 feet, and was seen for a length of 300 feet. 
The presence of the Millepore limestone in this situation, not only 
above the chalky rubble, but also above the Estuarine Sand, can only 
be explained by supposing the limestone has been carried over the 
newer deposits by some transporting agency, presumably Glacial. 
There is no place in the immediate neighbourhood from which the 
Millepore Oolite could have slipped by gravity into its present position. 
During the past two years the face of the quarry has been carried 
back at least ten yards, and the sections exposed have been constantly 
under observation. As might be expected, the Millepore beds at the 
base and the Sands above them, owing to their disturbed and shaken 
condition, have shown constant change in detail as the section was 
cut back, but they have maintained their relative positions. The 
rubble-drift also has shown much variation in thickness and arrange- 
ment. On the other hand, the narrow band of clay above the drift 
has shewn little alteration, and has persisted uniformly underneath 
the displaced slabs of Millepore. The displaced limestone itself has 
gained in thickness and regularity as the excavation has been carried 
deeper into the hill. 
It would be premature to attempt at present a complete explana- 
tion of this puzzling section, as the full extent of the displacement has 
not yet been disclosed. It is, however, now evident that the com- 
plications include two distinct factors : — 
(1) The confusion due to the irregular downward movement of 
the Millepore beds, caused by slips or creep over the shaly Lias, brought 
