B. Jasin, PERMO-TRIASSIC RADIOLARIA FROM THE SEMANGGOL FORMATION, NORTHWEST PENINSULAR MALAYSIA, Journal of Asian earth sciences, 15(1), 1997, pp. 43-53
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.