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TERTIARY: Headon Series and beds between the Paris Gypsum and the Gres de Beauchamp: 14: 10 English, 4 French. Barton Clay and Sables de Beauchamp: 0. London Clay, including the Kyson Sand: 7 English. Plastic Clay and Lignite: 9: 7 French, 2 English. Sables de Bracheux: 1 French. Thanet Sands and Lower Landenian of Belgium: 0. SECONDARY: Maestricht Chalk: 0. White Chalk: 0. Chalk Marl: 0.
Among the formations alluded to, the Thanet Sands of Prestwich have been sufficiently described in the last chapter, and classed as Lower Eocene. To the same tertiary series belong the Belgian formations, called by Professor Dumont, Landenian.
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