One confounding factor is that the late Cretaceous was also a period of great volcanic activity.

ECONOMIST: Mass extinctions

These devices are akin to the mammals of the late Cretaceous, ready to dominate the post-dinosaur world.

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My piece is set in the late Cretaceous period, 65 million years ago (give or take a few).

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Castel has adjudicated cases involving accused mobsters (John Gotti, Jr.) and cases involving rappers (Kanye West) but never one with a party from the late Cretaceous.

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In addition, this skew toward giant sizes generally happened toward the end of major time periods, such as the Late Triassic, Late Jurassic and Late Cretaceous.

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This story, though, raises the question of why there is but a single ejecta layer of iridium and shocked quartz in late Cretaceous rocks around the world.

ECONOMIST: Mass extinctions

Most models set up to try to figure out what happened during the Late Cretaceous climate changes conclude that water sank from the surface to the bottom of the ocean around Antarctica or the North Pacific.

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The fossils ranged from small Eocene swimmers imprinted on rock to the remains of late-Cretaceous dinosaurs.

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But, at about six hectares (15 acres), it already looks like the most important late-Cretaceous fossil bed in the world.

ECONOMIST: Dinosaurs