Ancient Species -
Algae

The term "algae" refers to organisms which are aquatic and which manufacture their own food by "capturing" light energy to manufacture sugars. It includes photosynthetic bacteria (cyanobacteria), chromista ("coloured algae"), and rhodophyta ("red algae"), as well as "green algae" - none of which are closely related.

Some algae secrete silica or calcium carbonate and fossil records of such  algae date back to the Proterozoic Period about 1,250 years ago. Limestone deposits which originated as coral reefs usually contain large amounts of calcium carbonate from algae secretions. In some cases, algae contribute more to the building of coral reefs than coral do.

Green algae

 

Algae fossils now available (at eBay):

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Fossil Margaretia Dorus Algae Trilobite Age Wheeler Fm MD61

AU $11.19
End Date: Wednesday May-15-2019 21:31:08 EST
Buy It Now for only: AU $11.19
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Fossil Margaretia Dorus Algae Trilobite Age Wheeler Fm MD41

AU $20.97
End Date: Tuesday Apr-30-2019 3:16:49 EST
Buy It Now for only: AU $20.97
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Fossil Margaretia Dorus Algae Trilobite Age Wheeler Fm MD46

AU $12.58
End Date: Monday May-20-2019 7:12:06 EST
Buy It Now for only: AU $12.58
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