Kajian awal radiolaria berusia Trias dari Formasi Semanggol di Bukit Lada, Kedah


Author : Siti Norhajar Hassan & Basir JasinPublication : Bulletin of the Geological Society of MalaysiaVolume : 49Page : 67-70Year : 2004


Description

Bulletin of the Geological Society of Malaysia, Volume 49, April 2004, pp. 67 - 70

 

Kajian awal radiolaria berusia Trias dari Formasi Semanggol di Bukit Lada, Kedah

SITI NORHAJAR HASSAN & BASIR JASIN

Program Geologi, Fakulti Sains & Teknologi, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor

 

Abstrak: Lima belas spesies radiolaria telah dikenalpasti dari lokaliti baru di Bukit Lada, Kedah. Himpunan radiolaria yang ditemui terdiri daripada Busuanga sp., Cryptosphenidium sp., Cryptosphenidium verrucosum, Eptingium manfredi, Eptingium manfredi robustum, Parasepsagon asymmetricus praetetracanthus, Parasepsagon variabilis, Planispinocyrtis sp., Pseudostylosphaera compacta, Pseudostylosphaera longispinosa, Pseudostylosphaera japonica, Pseudostylosphaera magnispinosa, Pseudostylosphaera helicata, Pseudostylosphaera coccostyla dan Triassocampe deweveri. Kehadiran Zon himpunan Triassocampe deweveri dan Zon himpunan Eptingium manfredi robustum telah memberikan usia rijang di Bukit Lada adalah Trias Tengah iaitu dari julat usia Anisian hingga Ladinian.

 

Abstract: Fifteen species of radiolarians were identified from a new locality in Bukit Lada, Kedah. The radiolarian assemblages consist of Busuanga sp., Cryptosphenidium sp., Cryptosphenidium verrucosum, Eptingium manfredi, Eptingium manfredi robustum, Parasepsagon asymmetricus praetetracanthus, Parasepsagon variabilis, Planispinocyrtis sp., Pseudostylosphaera compacta, Pseudostylosphaera longispinosa, Pseudostylosphaera japonica, Pseudostylosphaera magnispinosa, Pseudostylosphaera helicata, Pseudostylosphaera coccostyla and Triassocampe deweveri. The existence of Triassocampe deweri assemblage- Zone and Eptingium manfredi robustum assemblage- Zone indicate that the age of the Bukit Lada chert is Middle Triassic ranging from Anisian to Ladinian.