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Of the vegetation of such islands we have scarcely any indication, but it consisted partly of cycadaceous plants; for a fragment of one of these was found by Captain Ibbetson in the Chalk Marl of the Isle of Wight, and is referred by A. Brongniart to Clathraria Lyellii, Mantell, a species common to the antecedent Wealden period.
After a few hundred yards of thick forest, containing many trees which were quite unknown to me, but which Summerlee, who was the botanist of the party, recognized as forms of conifera and of cycadaceous plants which have long passed away in the world below, we entered a region where the stream widened out and formed a considerable bog.
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