Physical Sciences and Mathematics Commons^™

Intraformational Parabolic Recumbent Folds In The Coconino Sandstone (Permian) And Two Other Formations In Sedona, Arizona (Usa), John Whitmore, Guy Forsythe, Paul A. Garner

Science and Mathematics Faculty Publications

We report sedimentary structures that in all ways resemble parabolic recumbent folds (PRFs) in the cross-bedded portions of the Schnebly Hill Formation, the Coconino Sandstone and the Toroweap Formation (Arizona, USA). Field evidence suggests they are penecontemporaneous and intraformational. Intraformational refers to deformation that occurs between undeformed beds. Recumbent cross-bed sets occur over a wide area (>375 km2 [144 mi2]) at many different locations and horizons in the Sedona area, especially within the Coconino Sandstone. Deformation resulting from slumping dunes (dry or damp) is ruled out because of the nature of the deformation along cross-bed dip, the size and …