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。

In addition, the sediment comes from a window of time during the Pliocene Epoch, when greenhouse gas levels were only slightly higher than they are today.

此外，这些沉积物形成于上新世窗口期，那时的温室气体水平仅比现在稍高一点。

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。

In the Pliocene Epoch there was the leggy, sprinting Homotherium, and more recently, in the Pleistocene, we find the famous Smilodon.

在上新世时期，有长腿、奔跑的同兽，最近，在更新世，我们发现了著名的剑齿虎。

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。

Then, as the Pliocene Epoch opened about 4 million years ago, one of the single-toed groups of equines finally gave rise to Equus, the genus of the modern horse.

然后，随着大约 400 万年前的上新世时代开始，单趾马科动物群中的一个终于进化出了现代马属马属。