第二章研究古代东北地区城市的空间形态。
The second chapter researches ancient spatial morphology of northeast city.
中国东北地区小兴安岭北段分布的兴东群与佳木斯地区的麻山群一直被认为是早元古代形成的变质岩系。
The Xingdong Group distributed in the northern Xiao Hinggan Mountains and the Mashan Group in the Jiamusi area, Northeast China, are always considered to be Early Proterozoic metamorphic rocks.
研究表明，本区古元古代及更早时期的岩浆活动确切记录很少，反映出赣东北地区可能没有古老的陆壳。
No precise datum related to magmatism of Early Proterozoic or earlier ages is found, which might reveal the lack of old continent crust in this area.
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