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With Polished Surface.
19th Century.
Height: 8 cm / 3 inches
Width: 20 cm / 8 inches
Depth: 15 cm / 6 inches
Stromatolites are layered biochemical accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains in biofilms (specifically microbial mats), through the action of certain microbial life forms .
They have a variety of shapes and structures, or morphologies. Stromatolites occur widely in the Precambrian fossil record, but are rare today.
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US$40
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