Mollusca from the Insect Limestone (Bembridge Marls Member: Bouldnor Formation: Solent Group), Palaeogene, Isle of Wight, southern England

Molluscs from the Insect Limestone of the Bembridge Marls Member are described. The gastropodsLymnaea(Galba)longiscata(Brongniart 1810),Planorbarius discus(Edwards 1852),Gyraulus similisFérussac, 1814,Hippeutis headonensisJodot, 1942, Viviparuslentus(Solander 1766) andViviparus angulosus(J. Sowerby 1817) indicate freshwater alkaline conditions. The cerithioid gastropodTarebia acuta(J. Sowerby 1822) probably represent more brackish conditions.Polymesoda(Pseudocyrena)obovata(J. Sowerby 1817) is the only bivalve present. All were potentially washed into the depocentre. Despite a wide outcrop of the Insect Limestone on the Isle of Wight's northwest and northeast coasts, there are no records of molluscs other than from the Gurnard/Thorness Bay area on the northwest coast of the island.