Petrified tree fern-Calamites-
Shoal Creek Mine, Blue Creek Seam, 1500 foot depth, Adger, Alabama.
Carboniferous period – 359.2 Mya – 299.0 Mya.
14″ x 8″
Calamites is a genus of extinct arborescent (tree-like) horsetails to which the modern horsetails (genus Equisetum) are closely related. Unlike their herbaceous modern cousins, these plants were medium-sized trees, growing to heights of more than 30 meters (100 feet).
