Callixylon (Archaeopteridales) is the only type of fossil plant recorded from the Devonian of Oklahoma. Callixylon is found as petrified logs in the marine Woodford Shale.
Callixylon sp.OPC 3244-9582; Petrified Wood; Devonian; Woodford Shale; Pontotoc County, Oklahoma; CC BY-NC-ND 4.0
Callixylon sp.OPC 9999-8928; Petrified Wood; Devonian; CC BY-NC-ND 4.0
Callixylon sp.OPC 9999-9599; Petrified Wood; Devonian; CC BY-NC-ND 4.0