Soft Sediment Folds, Alaska - Interpreted

Note the typical significant thickness changes associated with soft sediment folding. Right above the antiformal features the sedimentary lamination has been destroyed, and one interpretation of this is that these are the result of focused fluid flow in a water-escape structure, that may have likely produced a sand boil at the surface (which likely was eroded away during the production of the truncation surface. Given this is Alaska, the easiest explanation for why the soft-sediment deformation happened is that it was due to an earthquake - i.e. it is a paleoseismite.

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