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西北地区泥盆纪古地理,以中天山—马鬃山隆起为界,阻隔为南、北两大海域,具有不同的腕足动物组合,恰似我国泥盆纪生物分区的一个缩影。本区的腕足类组合,在北方区属北极太平洋型,南方区属印度太平洋型。以秦岭为例,所计算的大冢系数值可与全球进行比较,结果表明,本区属于旧世界领域。
The Devonian paleogeography in the northwest region is bounded by the uplift of Zhongtian Mountain and Mazong Mountain and is divided into two major sea areas of south and north with different combinations of brachiopods and animals, which is just like a microcosm of the Devonian biospinning. The brachiopod assemblage in this area is of the Arctic Pacific type in the north and of the Indian Pacific in the south. Taking the Qinling Mountains as an example, the calculated Otsuka values can be compared with the global ones. The results show that the area belongs to the old world.