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Late Devonian - Early Carboniferous red coloured mudstones and sandstones are widely distributed in northwest Peninsular Malaysia. A relatively complete and well preserved sequence is exposed at Bumita Quarry, Hutan Aji, Periis, and is described herein. The facies associations observed are indicative of a marine prodelta-delta front depositional environment for the Mid-Palaeozoic red beds. A thin (9m) black mudstone facies in the middle of the Bumita Quarry sequence may represent the Latest Devonian Hangenberg Anoxic Event. The occurrence of a Mid­ Palaeozoic orogeny is refuted. The major regression just after the global Hangenberg Event transgressive episode is proposed as the cause of the major, pre-Carboniferous paraconformity observed in mid-Palaeozoic successions of the Sibumasu/Shan-Thai Terrane. Abstrak: Batu lumpur dan batu pasir merah berumur Devon Akhir - Karbon Awal tersingkap secara meluas di beberapa bahagian barat laut Semenanjung Malaysia. Satu turutan Devon Akhir-Karbon Awal yang hampir lengkap terdedah di Kuari Bumita, Hutan Aji, Periis, diperihalkan di sini. Gabungan-gabungan fasies yang dikenalpasti di lapangan ditafsirkan sebagai menunjukkan sekitaran enapan palaeo prodelta - hadapan delta marin bagi batuan merah Palaeozoik Tengah ini. Kehadiran fasies batu lumpur hitam yang nipis di tengah-tengah turutan Kuari Bumita mungkin mewakili Peristiwa Anoksik Hangenberg yang beriaku pada Akhir Devon. Tiada peristiwa orogen berumur Palaeozoik Tengah yang beriaku pada benua SibumasulShan - Thai. Regressi pasca Peristiwa Hangenberg dicadangkan sebagai punca paraselarasan berumur pra-Karbon yang diperhatikan dalam turutan batuan benua SibumasulShan-Thai.

The depositional environment of the Mid-Palaeozoic red beds at Hutan Aji, Perlis and its bearing on global eustatic sea level change