Thursday, August 20, 2009

Coloured Sands conglomerate

The most recognised images of the Coloured Sands of Rainbow Beach show bands of red and orange colours along the steep sand dune cliffs.   The coloured sands formed as a result of water moving through the sand mass, depositing iron-oxide minerals and organic matter in coloured bands.  Here is a conglomerate of coloured sand "pebbles" on a large boulder that must have fallen onto the beach.  We're not sure how these different coloured pebbles grouped and reformed into a conglomerate like this.  Double-click on the photo to see it up close.

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