Late Triassic Radiolaria from the Kodiang Limestone, northwest Peninsular Malaysia

Abstract

Two different cherty packstone-wackestone facies are exposed at an abandoned limestone quarry at Bukit Kodiang, Kedah. Chert occurs as discontinuous layers and nodules in the cherty packstone-wackestone. The thickness of individual chert layers varies from 2 to 10 cm. The facies exhibit slump folds. Eighteen species of Radiolaria were identified—Capnuchosphaera triassica De Wever, Triassocampe sulovensis Kozur and Mock, Tetraporobrachia asymmetrica Kozur and Mostler, Xenorum flexum Blome, Canoptum laxum Blome, Palaeosaturnalis triassicus Kozur and Mostler, Canoptum cf. farawayensis Blome, Pseudostylosphaera cf. spinulosa Nakaseko and Nishimura, Hagiastrum cf. augustum Pessagno, Perispongidium sp., Capnuchosphaera sp., Sarla sp., Kahlerosphaera sp., Canoptum sp., Latium sp., Paronaella sp., Sontonaella sp., and Spongostylus sp. The assemblage indicates that the age of the chert bearing strata ranges from late Carnian to middle Norian, Late Traissic.