by sysadmin | May 15, 2016 | Blog
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...
