File:Figure O-2C.jpg: Revision history

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    4 April 2016

    • curprev 20:1720:17, 4 April 2016ILSTRAT talk contribs 198 bytes +198 Fig. O-2C -- Massive Wise Lake Formation overlying the thinner bedded Dunleith Formation, which contains lenses and beds of white chert, in a quarry on the south side of Freeport, Stephenson County.