1) Order cordaitales 2) Plant order 
Cordaitales are an extinct order of woody plants that may have been early conifers, or which may have given rise to the conifers (Pinophyta), ginkgos (Ginkgophyta) and cycads (Cycadophyta). They had cone-like reproductive structures reminiscent of those of modern conifers. The Cordaitales appeared during the Carboniferous Period forming large tree...
an order of coniferophytes (phylum, sometimes division, Coniferophyta), fossil plants dominant during the Carboniferous Period (360 to 286 million ... [2 related articles]
[n] - extinct plants having tall arborescent trunks comparable to or more advanced than cycads
order Cordaitales noun extinct plants having tall arborescent trunks comparable to or more advanced than cycads; known from the Pennsylvanian period; probably extinct since the Mesozoic era