Rocky ground moraine is locally extensive. Average precipitation is 30 to 32 inches, almost identical to that of Sub-subsection VIII.1.1. The resistant Niagaran series dolomite and limestone of Silurian age form the Niagaran Escarpment, which is locally exposed as cliffs and flat limestone pavement along the Lake Michigan shoreline of the Stonington, Garden, and Door Peninsulas. Devonian limestone, dolomite, and breccia are locally exposed at the southern edge of the sub-subsection.
Limestone is mined in several places within the sub-subsection.
Various landforms of glacial lacustrine origin characterize the sub-subsection, including flat lake bed, deltaic deposits of sand, parabolic dune fields, and shallow embayments containing transverse dunes. On this topography, only a few inches of elevation change can greatly alter drainage conditions. Drainage conditions also depend on depth to underlying bedrock or fine-textured substrate. Ground moraine is quite extensive on the Door Peninsula in Wisconsin and locally present in Michigan south of Escanaba along the Lake Michigan shoreline and north of the Garden Peninsula. Bedrock is commonly exposed near the shoreline, either as cliff or flat pavement.