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Migration of a Late Cretaceous fish


Late Cretaceous sediments from the Western Interior of North America yield exceptionally well preserved fossils1,2 that serve as proxies for the rapidly changing climate preceding the Cretaceous/Tertiary boundary (about 67–65 Myr ago)3,4. Here we reconstruct the ontogenetic history of a Maastrichtian-age fish, Vorhisia vulpes5, by using the carbon, oxygen and strontium isotope ratios of four aragonite otoliths collected from the Fox Hills Formation of South Dakota. Individuals of V. vulpes spawned in brackish water (about 70–80% seawater) and during their first year migrated to open marine waters of the Western Interior Seaway, where they remained for 3 years before returning to the estuary, presumably to spawn and die. The mean δ18O from the marine growth phase of V. vulpes yields a seawater temperature of 18 °C, which is consistent with leaf physiognomy and general-circulation-model temperature estimates for the Western Interior during the latest Maastrichtian4,6,7.

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Figure 1: Palaeogeography and stratigraphy of the Fox Hills Formation of North and South Dakota.
Figure 2: δ18O (filled circles) and δ13C (open circles) values of Vorhisia vulpes otolith specimens 1 (SLU FR476) (a), 2 (SLU FR477) (b), 3 (SLU FR478) (c) and 4 (SLU FR479) (d).

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We thank G. Ludvigson, L. Gonzalez, T. White, H. Schwarcz and W. Patterson for comments on preliminary drafts of the manuscript, and N. Miller for strontium isotope analyses of biogenic carbonates.

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Correspondence to Scott J. Carpenter.

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Carpenter, S., Erickson, J. & Holland, F. Migration of a Late Cretaceous fish. Nature 423, 70–74 (2003).

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