Abstract
The mat-ministromatolite bioherms from the Proterozoic Wumishan Formation exhibit three orders of cyclic growth patterns. The growth cycle can be interpreted in terms of daily, monthly and seasonal periodicities. Mat-ministromatolite bioherms used as palaeontological clocks are limited to a short (daily and monthly) growth cycle. Based on the study of these stromatolites, it is estimated that there may have been about 40 to 49 palaeo-days per palaeo-month of 1200 Ma age.
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