Some Permian radiolarians from Bukit Yoi, Pokok Sena, Kedah

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.