Major Structural Features
The major structural lines on the Hengchun Peninsula trend north-south to N.20oE.. Three structural elements
can be recognized from west to east (Pelletier et al.,. 1986): the Hengchun Valley syncline, the Hengchun
fault, and the Kenting Park anticline. The Hengchun Valley syncline exposes Pliocene and Pleistocene
sediments. It is a gentle and open fold trending along the major valley that contains the city of Hengchun.
The Hengchun fault runs along the east side of the Hengchun valley. This fault continues northward to the
Chaochow fault or the Laonungchi fault on the east side of the Pingtung valley. All these faults are
important tectonic lines in Taiwan. The Kenting Park anticline is east of the Hengchun fault. This fold is
formed of intensely deformed Miocene rocks, and is a very complicated structure that traverses the entire
peninsula north to south. It may be considered a large-scale anticlinorium, beginning south from the
non-metamorphosed Changlo Formation and extending north to the slightly metamorphosed Lushan Formation.
Foliation and slaty cleavage become better developed gradually from the south toward the north, and are
quite pronounced in the Lushan Formation in the northern part of the peninsula. The Kenting Park anticline
trends N.20oE. and is an overturned anticline verging to the west. The folding deformed a thick sequence of
Miocene clastic rocks that was thrust westward over the Kenting melange. The Changlo Formation is exposed in
the core and the main part of the anticlinal crest, with the Loshui Formation exposed on the two flanks.