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Sandstone cast of a chambered Vertebraria root of the Glossopteridales, the characteristic group of gymnosperm trees that dominated Gondwanan polar forests during the middle to late Permian. This specimen was photographed at an outcrop of the Lopingian Takrouna Formation (Victoria Group, Beacon Supergroup) at an unnamed nunatak in the central Helliwell Hills, lower Rennick Glacier, East Antarctica.
Photo: Benjamin Bomfleur
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