June 5 2006. My relatives lived at Mill Green, Essex. The southern edge of Mill Green Common (Essex) is of geological interest in being where Monckton & Herries (Proceedings of the Geologist’s Association volume 11, p.22) discovered casts of univalves (i.e. gastropod shells) in a seven foot section of the Bagshot Formation dug by 1888 below a thinner layer of the extracted gravels. Normally the lower Bagshot Formation is devoid of fossils and this discovery confirmed that it was a marine, nearshore deposit, of similar age to the youngest parts of the London Clay exposed in Essex and Kent. Earlier geological accounts of Mill Green missed these fossils, probably because the pits were not so deep. Since then the relevant area has been made into gardens and woodland. Water for brick making and cottages was provided by a springline at the base of the overlying white micaceous Eocene sands of the Bagshot Formation. The latter crops out on the south side of Mill Green Common east of the cottages built before 1777. The main part of the common to the north of there and to the south of the kiln was occupied by early Pleistocene gravels and reworked Bagshot sands or clays termed the old Head by the geological survey. This yielded a third mineral aiding the cottage development, a form of hard core or road aggregate termed hoggin, composed of white coarse gravel grade flints and a few coarser cobbles (> 64 mm in geological definition) of more angular flint, quartz, quartzite and other stones introduced by an early glaciation of Essex.