Sashida et al. (1995) discovered late Middle Permian radiolarians from siliceous limestone block in the lower Chert Member of the Semanggol Formation exposed at Bukit Barak, Kedah. Eight species and five unidentified species belonging to 10 genera of Radiolaria are documented.Source: Sashida K., Adachi S., Igo H., Koike T. & Ibrahim Amnan, 1995. Middle and Late Permian radiolarians from the Semanggol Formation, Northwest Peninsular Malaysia. Trans. Proc. Palaeont. Soc. Japan, N.S. No. 177. pp. 43-58
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