Abstract
Stromatolite bioherms were found in the Lower Ordovician sediments of the Moyero River section (Tunguska syneclise, Eastern Siberia). Their characteristics are considered on the example of their typical build-up and adjacent sediments. It was revealed that the formation of the studied sediments occurred during the development of both bacterial communities (primarily cyanobacteria) and calcareous algae. The presence of remains of calcareous algae Nuia of different preservation in bioclast-oolitic and oolite-bioclastic limestones underlying stromatolite and composing sediments between bioherms was established. It is assumed that the growth of stromatolite bioherms and adjacent sediments was controlled by sea level fluctuations which were reflected in the transgressive-regressive cyclicity and changes of sedimentation conditions.
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