It's giving us an overview of the high Arctic during part of the Jurassic period for the very first time.
这差不多是相当于我们第一次对侏罗纪部分时期的高纬度北极地区有了大致了解。
The study area was in a tectonic setting of transtension during Early and Middle Jurassic, and the basins were reversed and uplifted in Late Jurassic.
早—中侏罗世研究区处于一种张扭构造环境之中，晚侏罗世盆地发生明显抬升和反转。
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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