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The Osborne beds are distinguished by peculiar species of Paludina, Melania, and Melanopsis, as also of Cypris and the seeds of Chara. These beds are seen both in Whitecliff Bay, Headon Hill, and Alum Bay, or at the east and west extremities of the Isle of Wight. The upper and lower portions are fresh-water, and the middle of mixed origin, sometimes brackish and marine.
Rissoa Chastelii, Nyst, sp. Paludina lenta. Next below are fresh-water and estuary marls and carbonaceous clays in the brackish-water portion of which are found abundantly Cerithium plicatum, Lam. The lower fresh-water and estuary marls contain Melania costata, Sowerby, Melanopsis, etc. This bed contains a mixture of Hempstead shells with those of the underlying Upper Eocene or Bembridge series.
Physa columnaris, Desh. Melanopsis buccinoidea, Ferr.; recent. The univalve shells most characteristic of fresh-water deposits are, Planorbis, Limnaea, and Paludina. Neritina globulus, Def. Nerita granulosa, Desh.
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