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Carbonate sediments of tectonically quiescent continental interiors are nearly ideal for precisely tracing eustatic sea-level change during major transgressions. Over roughly 10 million years during the later Middle Ordovician (Rocklandian through the middle Denmarkian stages), sea levels measured in the American Midwest rose about 10 m relative to the continent. Because the sediment accumulation rate in the epeiric sea was proportional to water depth, the time trend of sea level can be reconstructed from cumulative sediment thickness and from measurements on water depth throughout a stratigraphic section. Sea level is reconstructed as a function of time for six sections...

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