The rocks found at Stanton Drew

On checking back with my old posts, I found this from last October.

re the geology of the Stanton Drew stones, Geoff Kellaway said that the ice that crossed the Stanton Drew site came from the NW -- it crossed Broadfield Down, eroding the Lower Lias. It carried boulders of Upper ORS from the Failand Ridge, and entrained masses of Triassic conglomerate and Lower Lias breccia from Winford and Felton, and also picked up slabs of Dundry Freestone.

The builders of Stanton Drew used a litter of boulders of all these rock types -- they were opportunists and foragers who (naturally enough) simply wanted to minimise effort.

Is there any other geology that confirms or disputes Kellaway's identifications?