Ancient Species -

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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