New data on biostratigraphy of the Lower Cambrian Oldynda Formation of the Ozerny ore cluster, Western Transbaikalia, are reported. This formation is subdivided into eight members. It dates from the Atdabanian and Botomian Stages, with the boundary between them running along the bottom of the Nazarovka Member. It is concluded that staging of the Lower Cambrian in Siberia may be extrapolated to Transbaikalia. New species of archaeocyathids are described: Tumulocyathus postnikovi Zhur. and Dupliporocyathus? terleevi Zhur.

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First page of STRATIGRAPHY OF CAMBRIAN DEPOSITS IN THE OZERNY ORE CLUSTER (<italic>Western Transbaikalia</italic>)
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