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Title: Fossil Tree Roots
Caption: Stigmaria from the Carboniferous Period. Stigmaria are branching tree root fossils, usually from Sigillaria or Lepidodendron plants. The term stigmaria is a form taxon, identifying the shape of the fossil, but not the species. Illustration from Louis Figuier's The World Before the Deluge, 1867 American edition.
Credit: Album / Science Source
Image size: 3528 × 2100 px | 21.2 MB
Print size: 29.9 × 17.8 cm | 1389.0 × 826.8 in (300 dpi)