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北山系天山东延部分,其两侧下石炭统分布甚为广泛,均为海相沉积,以马鬃山(北山主峰)为界可划分为南、北两个相带(图1)。该区的下石炭统中含丰富的古生物化石,并夹有铁矿层。
Beishan is the eastern part of the Tianshan Mountains. The Lower Carboniferous rocks are widely distributed on both sides, all of which are marine sediments. The Mazong Mountain (the main peak of Beishan Mountain) can be divided into two facies belts (Figure 1). The Lower Carboniferous in this area is rich in paleontological fossils with iron ore layers.