Fossil horsetail (Asterophyllites equisetiformis) who lived in Carboniferous period (Pennsylvanian). Sample.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
License: Royalty Free
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Keywords: asterophyllites, calamitaceae, carboniferous, close-, equisetales, equisetiformis, fossil, geology, horstail, paleontology, pennsylvanian, sample, vertical