PERMO-TRIASSIC RADIOLARIA FROM THE SEMANGGOL FORMATION, NORTHWEST PENINSULAR MALAYSIA

A total of 32 species of radiolaria were identified from 20 chert samp les at eight localities of the Semanggol Formation in north and south Kedah. Three assemblages of Radiolaria were recognised representing th e Early Permian Pseudoalbaillella scalprata m. rhombothoracata, Late P ermian Albaillella levis, and Middle Triassic Triassocampe deweveri As semblage-Zone. The Pseudoalbaillella scalprata m. rhombothoracata Asse mblage-Zone is discovered from Bukit Kampung Yoi and Bukit Larek, nort h Kedah. The Albaillella levis Assemblage-Zone is recorded from Bukit Tok Bertanduk, north Kedah and Merbau Pulas, south Kedah. The Triassoc ampe deweveri Assemblage-Zone is found from the Lanjut Malau area, nor th Kedah. The radiolarian assemblages indicate that the age of the che rt sequence in the Semanggol Formation ranges from Early permian to Mi ddle Triassic. (C) 1997 Elsevier Science Ltd.