Is name proposed for third (of four, ascending) Paleozoic sequence, for the Kaskaskia River in south-central IL, in Illinois basin. Sequences ("operational units" established to facilitate interregional facies mapping) are assemblages of strata separated by objective horizons; should be considered as rock units, assemblages of formations and groups. Within the Kaskaskia drainage basin many thoroughly logged and sampled wells penetrate a typical development of the sequence from the base of Aux Vases sandstone to base of Wapsipinicon and other formations resting on lower Devonian and Silurian strata. Table 2 shows formations involved in limits of Kaskaskia at various localities on mid-America craton. Age of strata in the sequence in most cases is Chautauquan (Late Devonian) to Osagean (Early Mississippian).

Source: GNU records (USGS DDS-6; Denver GNULEX).