In Pei-I Highway at the point of the Ridge of Snow Mountains, we find a sudden drop of about 600 meters and there is no fault in the drop. In order to reach Lanyang Plain, we must negotiate 9 sharp bends and l8 changes of direction (red circle). So, we may imagine that the mountain has been cut out by a nature event, which may be a landslide of nearby Snow Mountains.
The original eastern slope of Snow Mountains may be symmetric to the
western slope. The profile from Taipei City to Toucheng
around Pei-I Highway denotes a landslide of eastern slope of Snow
Mountains.
摘錄自何顯榮教授《認識台灣古文明》
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