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Quantitative taxonomic composition of collections from the three Kola Switch collecting levels. a Lower bed, two collections from principle Kola Switch outcrop (USNM 40069 and USGS 9998A), one (USGS 9998B) 1.6 km east. b Middle bed, two collections (USGS 9998C and USNM 40070). c Upper bed, one collection (USNM 40071)
