PERTEMUAN PERSATUAN (MEETINGS OF THE SOCIETY) Structural geology of Gua Musang Formation in Kelantan Kelatan is a northern state of Peninsular Malaysia. The boundary of this state to the north is Thailand, easthern part is Terengganu, southern part is Pahang and westhern part with Perak and Kedah. This paper explains structural variation of all litologi of Gua Musang Formation in Negeri Kelantan. Geologicaly Negeri Kelantan are comprises of west Kelantan Olistostrom, Taku Schist and Gua Musang Formation. Igneus rock in Negeri Kelantan are granite, diorite porphire, andesite, ignimbrite dan dolerite. Structuraly Negeri Kelantan are boundared by olistostrom in the west and Lebir Fault Zone in the east. The method of this study is detailed measurement along the road and river. The analysis by the Dips programme and combination with manual method. Gua Musang Formation is mainly separate in Negeri Kelantan. Main fold of Gua Musang Formation in the middle part towards north- south up to north-northwest – south-southeast. In the northern part of this main fold terned by granite intrusion and diorite pophire towards NE-SW. The main of fault in the Gua Musang Formation are dekstral fault with strike N30-45oE and diping 60-70o to SE and of sinistral fault with strke N330-340oE and diping 60-80o to ENE-WSW. In the area boundared by igneus granit intrusion and near than main fault, Gua Musang Formation formed the compact and strongly folding. Itrusion of diorite pophire towards NE-SW have to terned the main fold of Gua Musang Formatin to follow this intrusion. The main compression who formed the folding and faulting of the Gua Musang Formation towards between WNW-ESE up to ENE-WSW. Warta Geologi, Vol. 36, No. 2, Apr–Jun 2010 97 Warta Geologi (Newsletter of the Geological Society of Malaysia), Vol. 36, No. 2, April-June 2010 Copyright © 2017 by Geological Society of Malaysia (GSM).