Close-up details of sliced cross section of a petrified tree fern, Tietea singularis, showing pattern of multiple bundled fern xylem toward the center and grainy root mantle toward the edges. Permian age specimen (250 million years old) from Tocantins state in Brazil. Lapidary cutting and polishing done by Steven Speer of Stick-in-Stones Lapidary.
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