Geology
The vale lies along the eroded core of an anticline, a westward extension of the Mendip Axis, with a relatively thin covering of Mesozoic sediments folded upwards over an up-faulted horst of Palaeozoic rocks. The floor of the vale is floored by Albian (Lower Cretaceous) beds of the Upper Greensand, exposed by removal of the overlying chalk. It is surrounded to the north and south by chalk scarps which close to the east near Burbage. There is also a small inlier of Greensand to the east at Shalbourne; this area drains northwards to the Kennet.
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