Septarian concretions: cracking diagenesis on a grand scale 👍😊. 'Moeraki Boulders' from Palaeocene mudstones on Koekohe beach, Otago, NZ. http://pic.twitter.com/3r33vetVw9
— John J Walsh (@johnjfwalsh) August 15, 2017
via Twitter https://twitter.com/johnjfwalsh
August 15, 2017 at 05:10PM
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