PROCEEDINGS COTTESWOLD CLUB 
1919 
114 
and western exposures of those rocks, which are almost separated 
by the South Staffordshire Coalfield. 
VI. The Stour-Evenlode Watershed and Avon Valley. 
On the watershed of the Stour and Evenlode rivers, between 
elevations of about 300 and 500 feet O.D., there are gravels 
and sands (Classes A., C. and D.), consisting of the debris of 
local Jurassic rocks, Triassic and other pebbles, and a greater 
proportion of Cretaceous material than is associated with the 
superficial deposits of any other part of the region under review. 
Some of the gravels to the east of Moreton-in-the-Marsh are 
composed of Triassic pebbles and grey flints with a little dark- 
coloured sand. At Great and Little Wolford there are in 
addition pebbles of hard white and red chalk. Many of these 
constituents were probably derived from Cretaceous strata 
that formerly extended over the district, others from the 
older Permian and Bunter Drift deposits, and from the Chalky 
Boulder Clay ice that advanced from the north-east towards 
the Cotteswolds approximately in a line extending from the 
north of Stockingford to Berkswell, Rugby, Southam, Fenny 
Compton, and Banbury. 
Woodward inferred that a lobe of the Chalky Boulder 
Clay ice extended from the main mass near Rugby for some 
distance down the Avon Valley and into the Vale of Moreton 
(212, pp. 485-86), but it seems unlikely that at this late stage 
of its progress it could have retained sufficient volume and 
propelling power to follow that course. If the contours of the 
area were relatively the same as at present, the advance would 
have continued along the falling gradient towards the Severn 
instead of turning to the higher ground of the Stour-Evenlode 
watershed, unless the Arenig or the Irish Sea ice filled the valley. 
It is equally improbable that water from the melting ice front 
would carry debris-laden ice-rafts over the same ground. 
During the melting of the north-eastern ice erosion may, 
however, have been much more active in the Avon Valley 
than on the Stour-Evenlode watershed, thus altering their 
relative levels. Another way by which ice or water could have 
