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Home > All Images > 1990 > April > 24 Apr 1990

Images Dated 24th April 1990

Choose from 7 pictures in our Images Dated 24th April 1990 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Stromatolite fossil Featured 24 Apr 1990 Print

Stromatolite fossil

Stromatolite fossil cut away to reveal the internal concentric banding. Stromatolites are large, stony, cushion-like masses, composed of numerous layers of cyanobacteria (blue-green algae) which have been preserved due to their ability to secrete calcium carbonate. They are among the oldest organic remains to have been found, the oldest structures dating from over 3000 million years ago. Stromatolite formation reached a peak during the late Precambrian period, but is still occuring today. Present-day formations can be seen in the Everglades, Florida, USA, and in Shark Bay, Australia