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What evidence do we have of a mass extinction between cretaceous and tertiary periods.

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Biology

What evidence do we have of a mass extinction between cretaceousand tertiary periods.

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Almost all the large vertebrates on Earth on land at sea and in the air all dinosaurs plesiosaurs mosasaurs and pterosaurs suddenly became extinct about 65 Ma at the end of the Cretaceous Period At the same time most plankton and many tropical invertebrates especially reefdwellers became extinct and many land plants were severely affected This extinction event marks a major boundary in Earths history the KT or CretaceousTertiary boundary and the end of the Mesozoic Era The KT extinctions were worldwide affecting all the major continents and oceans There are still arguments about just how short the event was It was certainly sudden in geological    See Answer
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