Observations on palynology of the Tukau Formation in northwest Sarawak, Malaysia

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Author : Yi Ning Fong, Dominique Dodge-Wan*, Prasanna Mohan Viswanathan
Publication : Bulletin of the Geological Society of Malaysia
Page : 75-90
Volume Number : 78
Year : 2024
DOI : https://doi.org/10.7186/bgsm78202407

Bulletin of the Geological Society of Malaysia, Volume 78, November 2024, pp. 75-90

Observations on palynology of the Tukau Formation in northwest Sarawak, Malaysia

 Yi Ning Fong, Dominique Dodge-Wan*, Prasanna Mohan Viswanathan

Department of Applied Sciences, Faculty of Engineering and Science, Curtin University Malaysia,

CDT 250, Miri, Sarawak, Malaysia

*Corresponding author email address: dominique@curtin.edu.my

Abstract: This palynological study analysed 15 samples of the Tukau Formation, comprising intensely bioturbated sandy mudstone and organic-rich mudstones. Diverse vegetation types, including hinterland, mangroves, back mangroves, and montane regions, characterise the landscape of the region during the Tukau sediment deposition. Certain palynomorph types, such as Rhizophora type, Laevigatosporites sp., Elaeocarpus type, Euphorbiaceae, and Verrucatosporites usmensis (Stenochlaena), dominated the pollen assemblage, which represents the ancient landscape at that time. The influx of non-mangrove palynomorphs from the hinterland, likely transported by water, underscores the role of fluvial processes in controlling pollen distribution. Notably, the presence of age-specific marker pollen, such as Florschuetzia levipoli, Florschuetzia meridionalis, and Florschuetzia trilobata, confirms the age of the formation as Middle Miocene or younger. The presence of Acrostichum aureum pollen suggests a warm and humid tropical climate. Recognition of mangrove pollen from both front and back mangrove vegetation suggests deposition in the seaward region of the coast with significant tidal influences.

Keywords: Tukau Formation, palynomorphs, clastic sediments, palaeoclimate, Sarawak

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Manuscript received 19 December 2023;
Received in revised form 11 January 2024;
Accepted 27 February 2024
Available online 30 November 2024

https://doi.org/10.7186/bgsm78202407

0126-6187; 2637-109X / Published by the Geological Society of Malaysia.
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