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A.3: Headon series, Isle of Wight: Calcaire siliceux, or Travertin Inferieur. A.4: Barton series. Sands and clays of Barton Cliff, Hants: Gres de Beauchamp, or Sables Moyens. B.1: Bracklesham series: Calcaire Grossier. B.2: Alum Bay and Bournemouth beds: Wanting in France? B.2: Wanting in England?: Soissonnais Sands, or Lits Coquilliers. C.1: London Clay: Argile de Londres, Cassel, near Dunkirk.
They fill a larger space in the Paris Basin between the Seine and the Loire, and constitute also part of the northern limits of the area of the Netherlands which are shaded in the map. A.1: Bembridge series, Isle of Wight: Gypseous series of Montmartre. A.2: Osborne or St. Helen's series, Isle of Wight: Calcaire siliceux, or Travertin Inferieur.
The calcaire siliceux and the calcaire grossier usually occupy distinct parts of the Paris basin, the one attaining its fullest development in those places where the other is of slight thickness. They are described by some writers as alternating with each other towards the centre of the basin, as at Sergy and Osny.
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