Calamites are a genus of extinct tree-like horsetails which are closely related to the current horsetails. Calamites were medium-sized trees of up to 10 (rarely 20 to 30) meters tall which spread in the coal sumps during the Carboniferous era.
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Details
Title: Fossil stone core of a horsetail with perforated hole and a core drill bit
Creator: Horst Schmadel, Seingbouse (F), Staatskanzlei des Saarlandes Open Gallery
Subject Keywords: Das Erbe Kapitel 1 – Kredit der Sonne
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