Chalk Group Lithostratigraphy: Northern England - Hall Farm Marl: Revision history

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10 October 2013

  • curprev 12:1612:16, 10 October 2013‎ Dbk talk contribs‎ 676 bytes +676‎ Created page with "A thin (less than 5mm) marl immediately underlain by a rubbly, locally iron-stained and indurated chalk bed; an association that makes it a conspicuous marker in quarry sectio..."
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