File:Figure S-2F.jpg: Revision history

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    5 April 2016

    • curprev 13:2213:22, 5 April 2016Alan.Myers talk contribs 201 bytes +201 Fig. S-2F -- Dense, argillaceous dolomite containing chert nodules characteristic of Racine interreef facies in the Chicago area. The outer, porous parts of the nodules are blackened by air pollutants.