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The Ordovician of the Siberian Platform exhibits a wide range of shallow-water facies in thick, normal marine and lagoonal carbonate-clastic sequences. It is illustrated herein by two west–east geological profiles across the Siberian Platform. Stratigraphic and paleontologic studies in this area led to subdivision of the Ordovician into 12 regional stages. Their boundaries correspond to changes in sedimentology and in taxonomic composition of a benthic fauna dominated by brachiopods and ostracodes. In most cases the precise correlation of regional with global stages is difficult, mainly because of the endemic character and sparse distribution of the East Siberian fauna in shallow-water...

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