Shale dykes in Carboniferous delta sequence
by David Tanner, Leibniz Institute for Applied Geophysics (LIAG), Hannover, Germany
These shale dykes or "ball and pillow" structures are exposed in the Carboniferous deltaic sequences in County Clare, Ireland. They are evidence of overpressuring of the shales by the sand bodies above them. Compass is 15cm long.
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David Tanner (distributed via imaggeo.egu.eu)