Their supremacy, like that of the mammals which eventually superseded them, was based on surviving a mass extinction that took out the competition
the Mesozoic era like colossi. Literally. The larger sauropods were the biggest animals ever to walk on land. Even in Mesozoic times, though, it was not always thus. The Mesozoic comprises three periods: the Triassic, the Jurassic and the Cretaceous. Colossus-like bestriding was restricted to the Jurassic and Cretaceous. So how did it come about?
Volcanoes dump carbon dioxide into the atmosphere, which tends to warm the climate. The late Triassic was already a period of high COlevels and high temperatures . A widespread assumption is therefore that the extinction was caused by yet further warming. Their evidence comes from lake deposits in the Junggar basin of Xinjiang. These straddle the boundary between Triassic and Jurassic. Many of the rocks in question are composed of grains of two different sizes, indicating those grains have different origins.
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