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#carboniferous period #coal formation #swamp forest #paleozoic #coal age #lycophyte forest

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#carboniferous period #geologic time scale #paleozoic era #coal age characteristics #ancient life

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#carboniferous period #paleoecology #coal forest #fern prairies #lycopsids #calamites

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#carboniferous period #amphibians #carboniferous tetrapods #swamp ecosystem #paleozoic life

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#arthropleura #long millipede #segmented body #carboniferous period #coal forest #prehistoric creature