268 PROCEEDINGS COTTESWOLD CLUB 1909 
Selbornian. Some, indeed the majority of these series 
of deposits once extended much further west, many 
probably across the broad Severn Valley, which was then 
non-existent. But in the plain referred to there are few 
good exposures of its constituent deposits, and in order 
to study them in detail it is best to travel to the shores 
of the English Channel and study the cliffs between 
Bridport and Swanage. 
In South Dorset the beds equivalent to the Freestone 
series of the Mid-Cotteswolds are subordinate in import- 
ance to those equivalent to the Ragstones—just the 
opposite to what is the case in the Cheltenham district. 
On the Dorset coast, between the Top-Beds of the In- 
ferior Oolite and the Forest Marble is nothing but clay, 
called the “ Fuller’s Earth Clay”; no limestone whatever. 
In the neighbourhood of Bradford-on-Avon, in Wiltshire, 
however, thick limestone beds suddenly make their appear- 
ance, and increase in importance to the north. They are 
known as the “ Great Oolite,” and furnish the celebrated 
Bath Stone. 
One of the most interesting questions in Bathonian 
geology that still awaits solution is whether the Great 
Oolite of the Bath district is in part or whole of the same 
date as any portion of the great clay series that inter- 
venes between the Top-Beds of the Inferior Oolite and 
Forest Marble in Dorset, and whether there is a non- 
sequence between the (Fuller’s Earth) clay-deposit there 
and the Forest Marble. 
On the shore of the West Fleet at a spot called 
Herby Leigh (or Herbury), about a quarter-of-a-mile 
north-west of Fleet House, near Langton Herring, is a 
very interesting exposure of Forest-Marble deposits— 
chiefly clays, but with a band of unmistakable Forest 
Marble exhibiting the well-known blue tint, and crowded 
with shell fragments—resting upon the Fuller's Earth. 
