File:Figure M-25.jpg: Revision history

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    4 April 2016

    • curprev 14:0814:08, 4 April 2016Alan.Myers talk contribs 175 bytes +175 Fig. M-25 -- Columnar section of the Chesterian Series (after Swan, 1963), showing biozones (after Collinson et al., 1971). In the columnar section, the blank areas are shale.