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

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 offree 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 fosH-fosH 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.

Constraining the Permian-Triassic boundary in the Gua Panjang Hill, Merapoh, Pahang state, Malaysia

“…The Gua Panjang hill is made up of carbonates (limestone and dolostone) (Figure 3) while the surrounding low-lying area is predominantly made up of mudstone and shale, often highly tuffaceous (Leman, 1993;. The limestone bed strikes in the NNW-SSE direction and dips 30°SW, suggesting that the Gua Panjang limestone praeparvus, H. postparvus, H. eurypge, and Isarcicella staeschi ( Figure 6).…”

The Gua Musang Group: A newly proposed stratigraphic unit for the Permo-Triassic sequence of Northern Central Belt, Peninsular Malaysi

“…Depositional Environment: Rich brachiopod assemblages and other benthic faunas were found in Sungai Toh, Sungai Yu, Merapoh, Padang Tengku, Terenggun, Penjom, Sungai Aring, and Chegar Perah (Muir-Wood, 1948;Aw, 1990;Leman, 1993Leman, , 1994Campi et al, 2002Campi et al, , 2005. Roadcuts and stream-cuts exposed good argillite outcrops which appear in various colors, from light to dark grey, reddish brown, brown, and black.…”

“…The Middle Permian to Late Triassic age of the Gua Musang formation and its lateral equivalents were determined based on fossil findings. Among them are Middle Permian fauna in Sungai Toh, Sungai Yu, and Padang Tengku (Leman, 1993;Campi et al, 2000Campi et al, , 2002Campi et al, , 2005; Upper Permian fossils in Terenggun, Merapoh, Penjom, and Padang Tengku (Hussin, 1990(Hussin, , 1994Leman, 1991Leman, , 1993Leman, , 1994Abdullah, 1993;Lim & Abdullah, 1994;Fontaine & Amnan, 1994;; Lower Triassic conodonts and bivalves in Merapoh, Chegar Perah, Gua Sei and Aring (Igo et al, 1966;Tamura, 1968Tamura, , 1973Aw, 1990;Metcalfe, 1992Metcalfe, , 1995; Middle Triassic fauna in Jerus, Gua Bama, Felda Aring, and Merapoh (Metcalfe, 1990; Fontaine & Amnan, 1994; Sone & Leman, 2004; (Aw, 1990). Diagnostic fossils which serve as index fossils and age determinants were found within formations of interest are listed in Table 2.…”

Gold‐Related Sulfide Mineralization and Ore Genesis of the Penjom Gold Deposit, Pahang, Malaysia

“…The Penjom gold deposit lies within the western margin of the Central Belt (gold belt 3). The Central Belt consists mainly of Permo-Triassic, low-grade metasediments, deep to shallow marine clastic sediments and limestone with abundant intermediate to acid volcanics and volcaniclastics, deposited in a paleo-arc basin ( Richardson, 1939;Proctor, 1972;Gobbett & Hutchison, 1973;Leman, 1994;Metcalfe, 2002 ). Batholiths in the Eastern Belt are smaller than those of Sibumasu, but are, in comparison, compositionally expanded.…”

“…6 ). Underlying this unit in the western fl ank is the older Sungai Sergis Formation, which is composed of a thick sequence of shale with very minor limestone intercalation and much thicker bands of tuff containing fragments of both rhyolite and andesite ( Scrivenor, 1928( Scrivenor, , 1931Richardson, 1939;Alexander, 1949;Nancy, 1972;Proctor, 1972;Gobbett & Hutchison, 1973;Nuraiteng, 1993;Leman, 1994;Campi et al , 2002 ).…”