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Sedimentary boulder on top of volcanic plug

posted 7 Jul 2017, 21:23 by Jamie Derkenne   [ updated 7 Jul 2017, 21:25 ]

Mt Eliza on Lord Howe Island is the remnants of a volcanic plug. Near its basalt and jasper peak lying by the side of the path is a semi-fossiliferous boulder that is obviously sedimentary. How did it get there?