Image: Crayfish back
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Description: Formation called Crayfish back, in Jenolan caves, Australia. The Nettle Cave hosts "Crayfish backs", stromatolites shaped by cyanobacteria, light and wind. They are estimated to be at least 20,000 years old.
Title: Crayfish back
Credit: Own work
Author: Schomynv
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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