Site 12 - Combe Down Oolite
A short walk along the made-up ride brings you to a marker post on the right hand side,
(GPS N 51o23.778' W 002o17.690'). Take the rough track to the rock face.
The rock here is the Combe Down Oolite and the feature to note is the very clear cross bedding shown by the rocks above the deep undercut. The cross bedding is terminated by the almost horizontally bedded layer above it. It is cross bedding such as displayed here that provides one of the clues to the environment in which the rock was deposited. It is interesting that the undercutting seen at Site 11 (and also at sites not visited) occurs at about the same level as at this site and suggests that it may result from the somewhat fissile nature of the cross beds.
Carry on along the made up ride to the car park, GPS N 51o23.761' W 002o17.512'