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These rows did not terminate downward in any instance which I could examine, nor upward, except at the point where they were cut off abruptly by the bed of gravel. On breaking open the pot-stones, I found an internal cylindrical nucleus of pure chalk, much harder than the ordinary surrounding chalk, and not crumbling to pieces like it, when exposed to the winter's frost.
These last, and certain sponges, may by their decomposition have furnished the silex, which, separating from the chalky mud, collected round organic bodies, or formed nodules, or filled shrinkage cracks. View of a chalk-pit at Horstead, near Norwich, showing the position of the pot-stones. From a drawing by Mrs.
Pisolitic Limestone of France. Chalk of Faxoe. Geographical Extent and Origin of the White Chalk. Chalky Matter now forming in the Bed of the Atlantic. Marked Difference between the Cretaceous and existing Fauna. Chalk-flints. Pot-stones of Horstead. Vitreous Sponges in the Chalk. Isolated Blocks of Foreign Rocks in the White Chalk supposed to be ice-borne.
At the distance of half a mile, the vertical piles of pot-stones were much farther apart from each other. Dr. Buckland has described very similar phenomena as characterising the white chalk on the north coast of Antrim, in Ireland. Ventriculites radiatus, Mantell. Syn. Ocellaria radiata. D'Orbigny.
A more difficult enigma is presented by the occurrence of certain huge flints, or pot-stones, as they are called in Norfolk, occurring singly, or arranged in nearly continuous columns at right angles to the ordinary and horizontal layers of small flints.
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