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Alisporites Anguisporites anticline Atoka Atoka formation bisaccate Bluejacket sandstone Boggy formation Brazil anticline Bull Cameron sandstone central body clay ironstone concretions conifer covered dark gray dense Description in feet diameter distal Ephedripites equator feet thick fissile to blocky flora Flowerpot Shale folds GENOTYPE genus Geology gray to brown gray to green Hartshorne formation Haskell County Hendricks holotype Infraturma interbedded with thin Keota Knechtel Latimer County LeFlore County McAlester coal McAlester formation micaceous microns long microns thick microns wide Oakes Okla OKLAHOMA GEOLOGICAL SURVEY Ouachita Mountains outcrop Pennsylvanian Permian Plate pollen portion Potonie and Klaus Potonie and Kremp proximal surface punctate Rhizomaspora ribs ripple marks sacci saccus sandstone beds sandstone member Savanna formation scolecodont Siltstone species Specimen OPC spores spores and pollen stratigraphic Strotersporites structure syncline Thickness Formational Description thin silty shale thin-bedded to massive tion Trochosporites tube cell unconformity Vittatina width Wilburton