This is not the first time that Oklo has seen nuclear fission shutdown. https://www.iaea.org/newscenter/news/meet-oklo-the-earths-two-billion-year-old-only-kno

This is not the first time that Oklo has seen nuclear fission shutdown. https://www.iaea.org/newscenter/news/meet-oklo-the-earths-two-billion-year-old-only-known-natural-nuclear-reactor https://www.iaea.org/newscenter/news/meet-oklo-the-earths-tw...