Molluscan and plant biostratigraphy of some Late Devensian and Flandrian deposits in Kent

摘要: Sequences of calcareous slope and spring deposits (mainly tufa) are described from two localities in Kent (Folkestone Wateringbury). They contain rich faunas terrestrial Mollusca, allowing a detailed reconstruction the local environments. The faunal changes also reveal an underlying common pattern, ascribed largely to effects climate migration. Eight biostratigraphical assemblage zones proposed, applicable this general character area southern England. base each zone is defined as follows: y first appearance molluscan fauna, dominantly Pupilla, Vallonia Vitrina ; z expansion Abida Trichia decline Pupilla , Carychium Aegopinella b occurrence Discus ruderatus c rotundatus suppression d Oxychilus cellarius e re-expansion f Helix aspersa . Botanical evidence (pollen seeds) some radiocarbon dates allow partial correlation with standard Godwin pollen Late Devensian (late-glacial) Flandrian.