Stigmaria - this is a fossilized root section of a Lepidodendron "tree" still embedded in the rock.
Over 300 million years ago, this area was covered in forest of these large tree-like plants, related to modern Club mosses.
County Clare, Ireland.

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A fossilized root section - Lepidodendron. Over 300 million years ago, while still living, these roots would have helped sustain huge tree-like plants (up to 50m) that thrived in the tropical conditions of the time.
County Clare, Ireland.

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On a moonlit night in the early Carboniferous, two Pulmonoscorpius do a mating dance in the Lepidodendron swamp. Although the giant scorpions have little interest in prey right now, a Balanerpeton amphibian wisely decides to swim away, while several Casineria sleep through the night in the copious tree litter.

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Stigmaria - a fossilized root section. In this case of a Lepidodendron - an ancient tree like relative of modern Club mosses that once grew up to 50m tall.
County Clare, Ireland.

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Lepidodendron yorkianum from the Carboniferous (from #BritishGeologicalSurvey R.L. Kidston photo collection). Looking similar to one of today's clubmosses http://geoscenic.bgs.ac.uk/asset-bank/action/viewAsset?id=63645

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