Chalk Group Lithostratigraphy: Northern England - Ulceby Marl: Revision history

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10 October 2013

  • curprev 14:3614:36, 10 October 2013‎ Dbk talk contribs‎ 1,359 bytes +1,359‎ Created page with "This marl, up to 70 mm thick, is distinguished from all other marls by being hard, silty and grey-brown in colour and characterised by abundant small crinoid columnals (Wood &..."
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