I am writing to ask your opinion (as an expert in glacial geomorphology) on the following observations. For some years my friends and I have been digging a cave on the south flank of the Mendip Hills (above Wells). After digging we often stop to admire the magnificent view across the Somerset levels.
Over time I have noticed that a lot of the small rounded hills on the levels, have a convex asymmetric profile, their longitudinal axis being roughly east to west. The westerly hill slope is gently graded (grass pasture used for cattle grazing), the easterly slope having a steep gradient (being unfarmed and wooded). In plan form some are crudely tear drop shaped. Their length to height ratio is approximately 4 or 5:1, the summits of the hills are generally at the eastern end, and 4/5 to 3/4 of the hills length to the east.
The more I look at them, the more the thought has grown that their assymetric shape (and orientation), could be due to easterly movement of glacial ice from the Bristol Channel? Could the hills be a form of roche moutonnee? There is no obvious structural explanation of their form. The hills are mainly composed of horizontally bedded Rhaetic and lower Jurassic strata, lying unconformably on Triassic Mercia Mudstone (playa lake deposits) and Triassic Dolomitic Conglomerate. The slopes cut across the contact indiscriminately. This rules out the role of stratal dip.
Yesterday, I pointed out the morphology of the hills to my friend; who is a geologist and Mining engineer( ex-Cambourne school of mines). His immediate comment was " If this was north of Watford then, I'd say it was due to glaciation".
This is an interesting observation, which I have never seen before -- and even Geoff Kellaway, who assembled much evidence for glaciation in Somerset, did not (as far as I know) mention possible streamlined hill shapes. Some more work is obviously needed on this........