Fossils of lycophytes are among the most common plant fossils reported in Oklahoma; one fossil, called Stigmaria,  . Lycophyte fossils may be found in rocks that were deposited during both the Pennsylvanian and Permian Periods, but are most commonly associated with coal seams (above, below, or in) where preservation occurred as impressions, compressions, casts and molds.

Members of Lepidodendrales are the best understood of the fossil lycopsids due to the vast diversity of Lepidodendrales specimens and the diversity in which they were preserved; the extensive distribution of Lepidodendrales specimens as well as their well-preservedness lends paleobotanists exceptionally detailed knowledge of the coal-swamp giants’ reproductive biology, vegetative development, and role in their paleoecosystem

This Root specimen is ten inches long four inches wide and weighs over seven pounds. 

It has root like characteristics as well as the pock markings  known for the tree bark and roots see photos 

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