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Above the orbitoidal limestone is a white limestone, sometimes soft and argillaceous, but in parts very compact and calcareous. It contains several peculiar corals, and a large Nautilus allied to N. ziczac; also in its upper bed a gigantic cetacean, called Zeuglodon by Owen.
Voluta nodosa, Sowerby. Phorus extensus, Sowerby. Nautilus centralis, Sowerby. Aturia ziczac, Bronn. Syn. Nautilus ziczac, Sowerby. London clay. Belosepia sepioidea, De Blainv. London clay. Leda amygdaloides, Sowerby. London clay. Astropecten crispatus, E. Forbes. The marine shells of the London Clay confirm the inference derivable from the plants and reptiles in favour of a high temperature.
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