Bulletin of the Geological Society of Malaysia, Volume 54, November 2008, pp. 53 – 58
Program Geologi, Pusat Pengajian Sains Sekitaran dan Sumber Alam, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
E-mail address: basir@pkrisc.cc.ukm.my
Abstract— A two metre thick chert sequence exposed at an excavation site at the northern slope of Bukit Yoi, south of Pokok Sena town. The chert sequence comprises chert layers interbedded with siliceous and tuffaceous mudstone. The chert samples yielded some fairly well-preserved radiolarians. Three radiolarian assemblage zones were identified i.e. Pseudoalbaillella scalprata m. rhombothoracata, Pseudoalbaillella longtanensis and Pseudoalbaillella globosa Zones. The Pseudoalbaillella scalprata m rhombothoracata Zone is indicative of late Sakmarian, Early Permian, Pseudoalbaillella longtanensis Zone represents the Kungurian and the Pseudoalbaillella globosa Zone represents the Roadian, Middle Permian.
Keywords: Permian, radiolarians, Semanggol Formation, chert, assemblage zone
Abstrak— Satu jujukan rijang berketebalan 2 meter telah tersingkap di suatu tapak potongan cerun utara Bukit Yoi, di selatan pekan Pokok Sena. Jujukan rijang terdiri daripada lapisan rijang yang berselang lapis dengan batu lumpur bersilika dan batu lumpur bertuf. Sampel rijang menghasilkan beberapa radiolaria yang terawet dengan baik. Tiga zon himpunan radiolaria telah dikenal pasti iaitu Zon Pseudoalbaillella scalprata m. rhombothoracata, Pseudoalbaillella longtanensis dan Pseudoalbaillella globosa. Zon Pseudoalbaillella scalprata m. rhombothoracata menunjukkan usia Sakmarian akhir, Perm Awal, Zon Pseudoalbaillella longtanensis mewakili usia Kungurian dan Zon Pseudoalbaillella globosa mewakili Roadian, Perm Tengah.
https://doi.org/10.7186/bgsm54200809
