Two HTC directions were observed from the Upper Triassic Yiwanshui Fm.
One is deemed inaccurate due to uncertain determination of paleohorizontal.
The other is interpreted as primary based on positive foldtest and dual polarity.
By late Triassic the Simao and the Baoshan terranes may have coalesced.
Collision of the Indochina Block with the SCB may have continued into end-Triassic.