On the Beds between the Gault and Upper Chalk near Folkestone

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Abstract
We have no better section of the Upper Cretaceous rocks than at Lydden Spout, which is a name given to a portion of the cliff between Folkestone and Dover. The chalk cliffs at this locality were carefully measured by Mr. C. E. De Rance, F.G.S. (of H.M. Geological Survey), and myself; and the height was found to be 433 feet above the mean sea-level. The thickness of the beds between the Upper Gault and the first bed of flints (Upper Chalk) is 348 feet. These beds I propose to divide into three general groups, i. e. Chalk Marl, Grey Chalk, and Lower Chalk, the former two corresponding with the Cénomanien of D'Orbigny, and the latter with his Turonien . As these divisions contain several well-marked lithological bands or beds, I have again subdivided them into six zones and nine beds, distinguishable by their palæontological contents or lithological characteristics. Mr. Whitaker, in vol. iv. p. 33 of the Geological-Survey Memoirs, quoting Phillips, estimates the Grey Chalk or Chalk Marl at about 200 feet, and describes it as varying in colour and texture, but softer, more sandy, and less compact than the other divisions. He makes his division extend to the top of the thin yellowish bed, the zone of Belemnites plenus . It will be seen from the present paper that I have given the same limits for the Grey Chalk and Chalk Marl together as Mr. Whitaker, and that I have estimated the thickness of those beds at 197 feet; but instead

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