Figure 2: Pima Point, looking east. Here, the second-order Supai Group can be broken down into two third-order sequences, and the lower third-order into two fourth-order sequences. The second-order Mississippian Redwall sequence is seen in the massive cliff, and karsting is evident at the top of the limestone unit. An incised valley fill is present at the top of the Esplanade/base of the Hermit Shale.