西湖还只是处于扬子古陆南部边缘的一处拗陷地带。
West Lake situated in the depression zone on the margin in the south of the Yangze old landmass.
黑沟一栾川大断裂，限定了古华北板块南部活动大陆边缘的边界。
The major disruption of Heigou-Luanchuan has determined the active continental margin of the ancient north China plate.
在泥盆纪期间，龙门山构造带北段位于上扬子古陆的西北边缘。
During the Devonian period, northward of Longmen Mountain structural belt is located in northwest border of Up Yangtzee Ancient Land.
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