Cross-bedded sandstone in the Pennsylvanian Kittanning Formation of the Allegheny Group exposed in a strip mine near Philipsburg, Pennsylvania, consists of large, inclined, sigmoid sedimentation units that overlap each other uniformly toward the west. Such features as the arrangement of sedimentation units and their internal bedding geometry suggest that the sandstone originated by deposition on the inside of a meander curve of a westwardly migrating stream channel.

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