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In this photo you can see the chain like segments along the edges of the layers.They look like single cell organisms that are building the host rock like on a coral reef. Perhaps, those bead like spheres are organisms laying the cell eggs that produce the rock that they can form in, and later drop out of, and start the process over again.
[http://www.jpl.nasa.gov/mer2004/rover-i … 56-med.jpg]http://www.jpl.nasa.gov/mer2004....med.jpg
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