I was rather intrigued when I came across a reference in MPP's new book (p 242) to a strange feature called Newall's Mound. Apparently it is just to the east of the Avenue, and maybe somewhere near the Elbow? Anyway, according to MPP, Atkinson and Evans cut a trench into it in 1978 -- and it is referred to as a "small raised feature." It's made of heavy clay mixed with natural flints -- so today it would probably be labelled as "clay-with-flints. " It's about 1.5 m thick, and MPP refers to it as a periglacial feature (?? really??) associated with a solution hollow about 5 m across. In MPP's words: "....created in Ice Age conditions not far south of the glacier's limit."
Leaving aside for the moment MPP's apparent conversion to the idea that there was glacier ice not far away from Stonehenge, I am rather intrigued by this deposit. Apparently John Evans discovered a buried early post-glacial soil and thought that the clay deposit had been thoroughly "bioturbated" by tree roots. Apparently Mike Allen and Charly French considered that the tree roots and the bioturbation had been responsible for preserving the mound as a raised feature while the rest of the surrounding area of clay-with-flints had been eroded away or smoothed down by the processes of erosion. I do not find this at all convincing -- I'd like to know why it is considered that bioturbation rather than cryoturbation was responsible for the "churning up" of the deposit. Evidence please?
I am also intrigued by the thought that a mound of clay-rich material should have been deposited over a solution hollow. Over solution hollows you normally get pits or depressions, since that is where solutional processes are concentrated, and where subsidence occurs. Instead, we have a raised feature in the landscape -- not very prominent, admittedly, but clearly prominent enough to have been given a name.........
I'm in the dark here, since I do not even know the exact location of this feature. Can anybody enlighten me? Did John Evans ever publish his research? Mike and Charly, if you are out there, can you please convince me that this is not a small morainic feature and that glacial processes might not have been involved at some stage in its formation?