Wise Lake Formation of Galena Group. Stratigraphically restricted in Minnesota; Stewartville Member is revised to Stewartville Formation. The Stewartville includes (ascending) Sinsinawa and Rifle Hill (new) members. In Illinois and Iowa, Stewartville Member is replaced with Rifle Hill Member. Age is Late Ordovician (Edenian). Report includes correlation chart, cross sections, graphic section. [See also entries under Rifle Hill and Stewartville.]
Source: Modified from GNU records (USGS DDS-6; Reston GNULEX, Denver GNULEX).
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