Structural Geology Of Semanggol Formation Emphasis on Gunung Semanggol, Perak Area

The Semanggol formation was believe to be separated in three different part of
tectonic which starts from Gunung Semangol, north Perak until Padang Terap, North
Kedah due to the formation of the strike slip Bok Bak fault and was believe
interpreted to be a deep marine enviroment before. This was proved by the study of
radiolarians on the Semanggol formation . The Semanggol formation was believe to
be once a continuous basin which was later truncated by wrench faulting while in
Muda Dam area which is in northeast Kedah, the formation was overlain conformably
by the Saiong Beds but elsewhere, the contact with adjacent lithostratigraphic of the
Semanggol formation are either faulted or unexposed. The Semanggol formation was
reported to be deform by repeated and rather tight folding but different situation was
observed in Bukit Kukus where the strike-slip faulting was observed to slice up the
chert outcrop together with the thrust faulting which can be observed in Bukit Barak
and Bukit Kukus also. The data obtain from the field shows that many fractures, folds
and reverse faults can be observed in the Gunung Semanggol area. The directions of
stress are according to the formation of the Bok Bak Fault stress which is East West.