The readily identified contact between Toroweap Formation and Coconino Sandstone is marked by contrasting planar, interbedded, multihued sandstones and mudstones of the Toroweap overlying distinctly crossbedded, buff-colored sandstones of the Coconino Sandstone (A); mega-crossbeds, the pervasive sedimentary structure within the Coconino Sandstone (B).