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Intraformational Parabolic Recumbent Folds In The Coconino Sandstone (Permian) And Two Other Formations In Sedona, Arizona (Usa), John Whitmore, Guy Forsythe, Paul A. Garner
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 …
The Petrology Of The Coconino Sandstone (Permian), Arizona, Usa, John Whitmore, Raymond Strom, Stephen Cheung, Paul A. Garner
The Petrology Of The Coconino Sandstone (Permian), Arizona, Usa, John Whitmore, Raymond Strom, Stephen Cheung, Paul A. Garner
Science and Mathematics Faculty Publications
The purpose of this paper is to give a description of the overall petrology of the Permian Coconino Sandstone that outcrops prominently in Arizona, including the Grand Canyon. The Coconino is often regarded as something like a “type” of the many similar Permian cross-bedded sandstones that occur around the world. It is generally accepted that the Coconino is an eolian sandstone and that its sand grains are well-sorted and well-rounded. However, until now, no detailed petrographic work has ever been published to substantiate these assumptions. We widely sampled the thickness and lateral extent of the formation and then studied hundreds …