Ancient Shell Has Revealed Exactly How Much Shorter Days Were 70 Million Years Ago – ScienceAlert

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Ancient Shell Has Revealed Exactly How Much Shorter Days Were 70 Million Years Ago – ScienceAlert

A chunk of rock that had been buried in the ground for millions of years has become a new clock for understanding Earth’s rotation. Analysis of a fossilised Cretaceous-era bivalve shell has revealed that our planet’s days were half an hour shorter 70
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