Monday, 5 September 2011

Stromatolite ~

Stromatolite is formed from layers of silt built up by the interaction of tiny organisms such as algae with their shallow watery environments.  My understanding is that these rocks could be described as sedimentary.  Certainly they can be very ancient indeed.  The Wikipedia article informs that: 
...stromatolites provide some of the most ancient records of life on Earth.
This polished slab is dramatic:

And here we see the back - or unpolished side:

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