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Fossil tree trapped in lava flows. The coast nearby has many examples of basalt columns, not all upright!
PhotoID775

Fossil tree trapped in lava flows. The coast nearby has many examples of basalt columns, not all upright!
PhotoID775

Photograph: Penny Johnson

Reference: http://www.scottishgeology.com/geo/regional-geology/highlands/mull-maccullochs-tree/