Facies models and successions are outlined for the North American, Avalon, Baltic, Armorican and S European platforms, showing that glauconite and apatite formed partly behind carbonate barriers but mostly on ocean-facing shelves. Phosphogenic rhythms on the Avalon and Baltic platforms are related to transgressions and regressions while the Cambrian phosphogenic episode may be linked with invertebrate evolution, phytoplankton blooms and a rise in the O2 minimum.

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