984 Middle and Late Permian radiolarians from the Semanggol Formation, Northwest Peninsular Malaysia

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  • Middle and Late Permian Radiolarians from the Semanggol Formation,Northwest Peninsular Malaysia
  • Middle and Late Permian Radiolarians fr

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Abstract

The Semanggol Formation exposed in the northwestern part of Peninsular Malaysia is subdivided into the lower Chert, middle Rhythmite, and upper Conglomerate Members. Previous to the present study, this formation was regarded as Triassic because of the occurrence of Daonella and Halobia in the middle Rhythmite Member. We newly recovered late Middle Permian radiolarians, including Follicucullus monacanthus, from an allochthonous siliceous limestone block contained in the upper part of the lower Chert Member exposed at Bukit Barak, 25km northeast of Alor Setar. Furthermore, moderately well preserved Late Permian radiolarians belonging to the Neoalbaillella optima and N. ornithoformis Assemblages were discovered in chert beds of the same member exposed at Bukit Nyan, 20km east of Alor Setar. These Permian radiolarian faunas are very similar to those reported from Japan, the Philippines, and southern China. We interpret the significance of this occurrence in the paleobiogeography of Peninsular Malaysia during Late Paleozoic to Early Mesozoic times. Eight species and five unidentified species belonging to 10 genera of Radiolaria are systematically described in this paper.

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