Permian Radiolarian Biostratigraphy of the Semanggol Formation, south Kedah, Peninsular Malaysia

Abstract

Thirty-seven taxa of Permian radiolarians were retrieved from chert samples collected from an outcrop at a construction site approximately 4.5 kIn east of Kuala Ketil Town. The chert samples were collected from interbedded siliceous shale, chert and tuff facies and thinly bedded chert facies. Five radiolarian assemblage-zones were recognized i.e. Pseudoalbaillella scalprata In. rhombothoracata Zone, Follicucullus monacantha Zone, Follucucullus porrectus Zone, Neoalbaillella ornithoformis Zone and Neoalbaillella opima Zone. The radiolarian zones represent an age range from late Early Permian to Late Permian. Abstrak: Tiga puluh tujuh taksa radiolaria Perm telah diperolehi daripada sampel rijang yang dikutip dari satu singkapan tapak binaan yang terletak 4.5 kIn di timur pekan Kuala Ketil. Sampel rijang dikutip daripada fasies selanglapis syal bersilika, rijang dan tuff dan fasies rijang berpelapisan nipis. Lima zon himpunan radiolaria telah dikenali iaitu; Zon Pseudoalbaillella scalprata In. rhombothoracata, Zon Follicucullus monacanthus, Zon Follicucullus porrectus, Zon Neoalbaillella omithoformis dan Neoalbaillella optima. Zon radiolaria ini mewakili julat usia dari akhir Perm Awal hingga Perm Akhir.