Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Ch. XX.] FOSSILS OF THE PORTLAXD STOXE. 395 ruinous matter may have been, in part at least, derived from the de- composition of vegetables. But as impressions of plants are rare in Fisr. 3 . J nai, size Portland Stone. Fie. 354.

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