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Temperature and salinity of the Late Cretaceous Western Interior Seaway

The Western Interior Seaway (WIS) was a shallow and expansive body of water that covered the central United States during the Late Cretaceous. Attempts to reconstruct temperatures in the seaway using the oxygen isotopic composition of biogenic carbonates have suffered from uncertainty in the oxygen isotopic composition of seawater ( 18 O w ) in the semi-restricted basin.
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