张家沟剖面沉积连续、暴露完全、化石极为丰富，是建立侏罗白垩系临界阶陆相层型和研究界线划分的理想剖面。

So the Zhangjiagou section is an ideal candidate section for erecting the terrestrial stratotype and studying the Jurassic-Cretaceous boundary in China.

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其科级分类阶元的分布型为10类。其中，以旧大陆热带、亚热带和温带分布型为主，次类型者有9科；

The families of these mammals were divided into 10 categories, in which the old-continent-tropic-subtropic and temperate zone is the largest type with 9 families.

youdao

其科级分类阶元的分布型为10类。其中，以旧大陆热带、亚热带和温带分布型为主，次类型者有9科；

The families of these mammals were divided into 10 categories, in which the old-continent-tropic-subtropic and temperate zone is the largest type with 9 families.

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