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Shark Otodus(also known as mackerel, shark) lived 60 million years ago during the Paleocene period. They were very large sharks around 30 feet in length. Fossilized short teeth are among the most popular type of fossils as sharks usually lost and replace 35,000 teeth per year. Most shark teeth fossils are from the.Cenozoic Period 65 million years ago and still exist in some form today.