Warta Geologi, Vol. 51, No. 3, December 2025, pp. 163-169
Meor Hakif Amir Hassan1,*, Abdul Kadir Ahmad Akhri1, Michael R.W. Amler2
1 Department of Geology, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
2 Faculty of Mathematics and Natural Sciences, Institute of Geology and Mineralogy, University of Cologne, 50674 Köln, Germany
*Corresponding author email address: meorhakif@um.edu.my
Abstract: Bivalve taxa are rare from the fossil assemblage in the Carboniferous Kubang Pasu Formation. This study reports the discovery of the pectinid bivalve Euchondria sp. from the Kubang Pasu Formation exposed at Bukit Tuntung, Pauh, in Perlis state, NW Peninsular Malaysia. A single left valve is preserved in light grey shale and associated with previously reported Early Carboniferous (Viséan) ammonoids and the bivalve Posidonia becheri. The morphology and anatomy of the specimen is described. The genus Euchondria ranges from the Late Devonian to Permian which is consistent with its association with the Kubang Pasu Formation fossil assemblage of Viséan age. The fossil assemblage at Bukit Tuntung, which is relatively sparse compared to equivalent strata in western Perlis and dominated by thin-shelled bivalves and nektonic ammonoids indicates a relatively deeper marine depositional setting, which is consistent with the presence of turbidites.
Keywords: Euchondria, Carboniferous, Kubang Pasu Formation, Perlis, dysaerobic facies
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Manuscript received 20 August 2025;
Received in revised form 29 October 2025;
Accepted 21 November 2025
Available online 30 December 2025
DOI: https://doi.org/10.7186/wg513202501
0126-5539; 2682-7549 / Published by the Geological Society of Malaysia.
© 2025 by the Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC-BY) License 4.0
