The upper part of the stratotype section of the Changcheng System in the Yanshan Range 100 km east of Beijing (Peking) has yielded small megascopic carbonaceous compressions assignable to Tyrasotaenia Gnilovskaya and Chuaria Walcott. These fossils are between 1700 and 1900 Ma old and may represent the oldest megascopic organisms now known.
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Hofmann et al. (1981) studied this question.
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