noun
a type of organic microfossil found in rocks dating from the Precambrian era
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The presence of acritarchs in the sedimentary rock indicates a marine environment during the time of deposition.
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I found some weird acritarch fossils while digging in my backyard.
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Those acritarchs look like tiny alien eggs!
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The acritarchs scattered throughout the painting added a mysterious and ancient feel to the artwork.