Rock 366 : Day 34 : Cone-in-Cone


Day 34 : This is a cone-in-cone structure.  The origin of these is somewhat mysterious, with the consensus appearing to be that they form during early diagenesis by expansive mineral growth.  This is from the Triassic near Market Drayton, Shropshire. Keele collection.

~ by hypocentre on February 3, 2012.

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