Abstract
The cherts in-the Hythe Beds (Lower Greensand, Aptian) of the western part of the Weald, southern England, have been re-examined. The cherts vary among themselves. Some possess petrographic characters which show them to have been formed by silicification of calcareous rocks and, contrary to all previous authors, it is claimed that replacement cherts are present in these beds. Sponge spicules are invariably present and most of the silica in the cherts is thought to have been, at one stage of its history, incorporated into the spicules and to have been subsequently redistributed diagenetically. Some of the cherts are sponge-spicule beds, as described by Hinde in the nineteenth century. The silica is thought to have been derived ultimately from tropical weathering of rocks exposed on the London land area.
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