The frontal riser of the first pediment surface (P1) is the most recent fault scarp or diluvial platform;at the foot of pediment P1 outcrops the fault.
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- 第1级麓原面(P1)的前缘陡坎为最新断层崖或洪积台地,断层崖的坡脚为断裂带地表出露位置;