Fossil Calamites (Giant horsetail) internal cast of stem showing branch scars. Byrmbo fossil forest, Wrexham, Wales.

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Keywords: britain, british, brymbo, calamites, cast, cymru, europe, european, fossil, fossilization, fossilized, fossils, giant, horse-tail, horse-tails, horsetail, horsetails, internal, temperate, uk, wales, welsh, western, wrexham