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Updated: June 10, 2025
At the base of this upper division of the Speeton clay there occurs a layer of large Septaria, formerly worked for the manufacture of cement. This bed is crowded with fossils, especially Ammonites, one species of which, three feet in diameter, was observed by Mr. Judd. Pecten cinctus, Sowerby. Middle and Lower Neocomian. Mr.
FOREIGN. Maestricht beds and Faxoe chalk. BRITISH. Sands of Folkestone, Sandgate, and Hythe. FOREIGN. Neocomian of Neufchatel, and Hils conglomerate of North Germany. BRITISH. Upper Purbeck beds, fresh-water. FOREIGN. Marnes a gryphees virgules of Argonne. BRITISH. Coral rag of Berkshire, Wilts, and Yorkshire. FOREIGN. Nerinaean limestone of the Jura. BRITISH. Cornbrash and forest marble.
Professor Ramsay has remarked that there is a stratigraphical break; for in Kent, Surrey, and Sussex, at those few points where there are exposures of junctions of the Gault and Neocomian, the surface of the latter has been much eroded or denuded, while to the westward of the great chalk escarpment the unconformability of the two groups is equally striking.
Considering this resemblance, and that the fossils from the Puente del Inca at the base of the gypseous formation, and throughout the greater part of its entire thickness on the Peuquenes range, indicate the Neocomian period, that is, the dawn of the cretaceous system, or, as some have believed, a passage between this latter and the oolitic series I conclude that probably the gypseous and associated beds in all the sections hitherto described, belong to the same great formation, which I have denominated cretaceo-oolitic.
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