A Late Cretaceous-aged nautiloid (left) and ammonite (right curled and right and bottom straight fossils) found in South Dakota show that at least some species lived in the same location. Credit: Michael Schmutzer (IMAGE)

European Geosciences Union

A Late Cretaceous-aged nautiloid (left) and ammonite (right curled and right and bottom straight fossils) found in South Dakota show that at least some species lived in the same location. Credit: Michael Schmutzer

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A Late Cretaceous-aged nautiloid (left) and ammonite (right curled and right and bottom straight fossils) found in South Dakota show that at least some species lived in the same location. Credit: Michael Schmutzer

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Michael Schmutzer

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