With thanks to Sean Edwards
Hydon's Ball section and simplified list of strata:
5 Sandstone
6 Large Paludina
7 Sandstone
h1e Weald Clay
h2a Atherfield Clay
h2b Hythe Beds
h2c Sandgate Beds
These 3D models were made by Sean Edwards in the 1960's and built on a 2' x 1' plywood base, with polystyrene contour layers cut with a craft knife, the steps filled with plaster of Paris, smoothed by hand and painted with acrylic paint.
Unfortunately only black and white photographs now exist and the models, borrowed by the 'Fight the Red Route' A3 group, have never re-appeard. The circular pin-head on the Puttenham (Sandgate) beds marks the position of the Three Horseshoes.