The significance of Upper Permian brachiopods from Merapuh area, northwest Pahang


Author : Mohd Shafeea LemanPublication : Bulletin of the Geological Society of MalaysiaVolume : 35Page : 113-121Year : 1994


Description

Bulletin of the Geological Society of Malaysia, Volume 35, July 1994, pp. 113-121

 

The significance of Upper Permian brachiopods from Merapoh area, northwest Pahang

MOHD SHAFEEA LEMAN

Jabatan Geologi, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan

 

Abstract: Several localities of Upper Permian brachiopod dominated shelly fauna have been discovered from the Merapoh area in northwest Pahang. The fauna consists of more than forty species of free living and pedunculate brachiopods, associated with other benthic elements such as bivalves, gastropods, fenestrate and stony bryozoans, solitary rugose corals, trilobites etc. Most of the fossils are preserved as moulds and casts, but they show very good biocoenosis assemblages. The brachiopods assemblages belong to the Upper Permian Leptodus Shale fauna which shows some similarities with other Upper Permian fauna from southern Tethyan region. Stratigraphically, the brachiopod fauna can be divided into two zones, the Oldhamina dicipens and the Haydenella minuta Zones, equivalent to the lower and middle Dorashamian (= Changshingian) Stages, respectively. The Leptodus Shale fauna is developed on shallow carbonate and volcanic high during a period of active volcanism.

 

Abstrak: Beberapa lokaliti fauna cengkerang berusia Perm Akhir yang didominasi oleh brakiopod telah ditemui daripada kawasan Merapoh di baratlaut Pahang. Fauna ini mengandungi lebih daripada empat puluh spesies brakiopod yang hidup bebas serta yang melekat dengan pedikel. Fauna ini berasosiasi dengan unsur-unsur bentos lain seperti bivalvia, gastropod, briozoa fenestrat dan briozoa membatu, karang rugosa tunggal, trilobit dan lain-lain. Kebanyakan fosil terawet sebagai acuan dan kas, tetapi fosil-fosil ini menunjukkan himpunan biosinosis yang baik. Himpunan brakiopod ini kepunyaan fauna syal Leptodus berusia Perm Akhir yang menunjukkan beberapa persamaan dengan fauna berusia Perm Akhir dari daerah Tethys selatan yang lain. Secara stratigrafi, fauna brakiopod ini dapat dibahagi kepada dua zon, iaitu Zon Oldhamina dicipens dan Zon Haydenella minuta, setara dengan Tahap Dorashamian (= Changshingian) awal dan tengah. Fauna syal Leptodus ini terbentuk di atas karbonat dan volkanik yang cetek ketika volkanisme agak aktif.