Studying ancient fast growing mollusks, that create a new growth rings every day, indicated that the day was a half hour shorter 70 million years ago.
https://phys.org/news/2020-03-ancient-shell-days-half-hour-shorter.html
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Studying ancient fast growing mollusks, that create a new growth rings every day, indicated that the day was a half hour shorter 70 million years ago.
https://phys.org/news/2020-03-ancient-shell-days-half-hour-shorter.html