Grades. The last dinosaurs died approximately 65 million years ago. By Bonnie Sachatello-SawyerDon, Liza Charlesworth. The genus Nothosaurus was described in 1834, but the sub family Nothosaurinae was coined almost a century later in the year 1923. How Did the Dinosaurs Become Extinct? 17 January 2020 @ 17:05 SCIENTISTS have come up with evidence of how at least 70% of the dinosaur population was wiped out in a study at Yale University, in which palaeontologist Dr Laia Alegret (pictured), took part. Why Did Dinosaurs Become Extinct: Deccan Traps Extinction Theory The Deccan Traps are huge volcanic rock formations that cover 500,000 square km (193,051 square miles). They now form the Deccan Plateau in west-central India. The extinction of the dinosaurs was the result of INCREASING SURFACE GRAVITY on the Earth. The theory I wrote, The Gravity Theory of Mass Extinction, explains how surface gravity on the Earth can, and has, changed- no change in mass is required. How did the dinosaurs become extinct? She’s been involved with Science-o-holic since 2016. Safiya Shormi (content writer & Web Developer) is a freelance content writer and an undergraduate student. Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. 3–5, 6–8. Although the cause of their extinction is still a mystery, climatic change, diseases, changing plant communities, and geologic events could all have played a role. Why Did All Dinosaurs Become Extinct? When did dinosaurs become extinct? The Earth's history has seen a number of mass extinctions but the most well known happened 65 million years ago during the late Cretaceous period, with the death of around 70 per cent of all species. This suggests that These enabled it to walk much like a sea lion. Unlike many marine reptiles that lived later in the Mesozoic, Nothosaurus had four strong legs. These enabled it to walk much like a sea lion. The Nothosaurus is classified under super order Sauropterygia, family Nothosauridae and sub family Nothosaurinae. “And if that became unsustainable, then the entire group would become extinct.” The ichthyosaurs simply weren’t able to “re-evolve” their more ancient, more transitional body types.

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