Moderately sorted, clast-supported sandstones and conglomerates containing abundant granitic or metamorphic gravel clasts in a tan to brown sand and silt matrix. QI surfaces are moderately incised by stream channels, but still contain constructional, relatively flat, interfluvial surfaces. QI soils typically have moderately clay-rich, tan to red-brown argillic horizons; these soils contain moderate amounts of pedogenic clay and some calcium carbonate, resulting in relatively low infiltration rates. Thus, these surfaces favor plants that draw moisture from near the surface. QI soils typically have Stage II calcium carbonate development.