earlier cretaceous period
earlier cretaceous period
早白垩纪
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The actual split between the two groups, though, had happened much earlier, during the Jurassic period, and by the late Cretaceous there were many species of bird around.
尽管，这两种物种早在侏罗纪时期就已分道扬镳，而且，到了白垩纪后期，已出现了许多种的鸟类。
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