The Overstep of the Sandgate Beds in the Eastern Weald

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Abstract
Comparatively little work has been done on the Lower Greensand of the eastern Weald for the last fifty years, whilst the current maps of H.M. Geological Survey are based on the original survey made under Topley prior to 1875. The general succession and fauna of the beds are fairly well known in East Kent, but in East Sussex, where the beds are thin, great difficulty has been found in the past in subdividing them and correlating them with the lithological subdivisions recognizable in other parts of the Weald. Detailed mapping of the outcrop has, however, shown that in the extreme east of Sussex the Sandgate Beds overstep the Hythe Beds to rest on the Weald Clay. A similar overstep is traceable in the Boulonnais and in the boreholes of the East Kent coalfield. The only literature relating to the Lower Greensand of Sussex is to be found in the pioneer accounts of Martin, Mantell, and Fitton, and in the memoirs of H.M. Geological Survey. In Topley's classic memoir (1875, p. 126) the Lower Greensand is described as retaining its usual lithological units to beyond Henfield, but farther east, owing to the disappearance of the distinctive stone bands, it was found to be incapable of subdivision. At a later date, part of the area was resurveyed by Lamplugh (Reid 1903), whilst the country farther east was redescribed, but not remapped, by Osborne White (1924, 1926), who also experienced difficulty in the correlation of the beds of the Lewes area with the

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