Megalodon disappeared entirely from the fossil record, just as the Pliocene epoch gave way to the Pleistocene.

巨齿鲨在地球的历史中彻底消失了，就像地质时代从上新世过渡到更新世那样。

But these humid, heavily forested ecosystems gradually diminished through the Miocene and into the Pliocene epoch as Australia became drier over time.

但随着澳大利亚随着时间的推移变得更加干燥，这些潮湿、森林茂密的生态系统在中新世和上新世逐渐消失。

Their fossils first appear in mainland Australia more than 3 million years ago in the Pliocene epoch, only reaching their current Indonesian island home in the Wallacea region around 1 million years ago.

它们的化石首次出现在 300 多万年前上新世的澳洲大陆，但他们只在约 100 万年前到达位于华莱士区的印尼岛屿上。