Sigillaria Bark

- Image ID: HRKKM4
Sigillaria Bark
Science History Images / Alamy Stock Photo
Image ID: HRKKM4
Bark of Sigillaria laevigata, a large tree-like plant from the Carboniferous Period. Sigillaria fossils are often found in coal mines. Illustration from Louis Figuier's The World Before the Deluge, 1867 American edition.

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