In Nature journal there is a study published based on footprints of land vertebrates concluding that vertebrates came to land 398 million years ago (in middle devonian) and not 380 millions ago as previouly thought. It means our ancestors left water 18 million years earlier than as previously thought.
Earlier studies were based on a short-lived intermediate stage of tetrapods represented by "elpistostegids" such as Tiktaalik.
But the latest foot prints based study has ammended the belief held earlier.
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