acritarch

(from the article `Cambrian Period`) ...(0.8 inch) in diameter and were probably more than 1 metre (3.3 feet) in height. Such large size is attained by modern green algae only in warm, ... Acritarchs are a catchall group of various small microfossils that may represent the pelagically dispersed spore cases of benthic algae. Four major ....
Found on http://www.britannica.com/eb/a-z/a/13

Acritarch

Acritarchs are small organic fossils, present from approximately {Ma|1400|3200} to the present. Their diversity reflects major ecological events such as the appearance of predation and the Cambrian explosion. ==Definition== In general, any small, non-acid soluble (i.e. non-carbonate, non-siliceous) organic structure that can not otherwise be accou...
Found on http://en.wikipedia.org/wiki/Acritarch
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