The Sandakan Formation of the Segama Group is exposed across the Sandakan Peninsular in eastern Sabah. This Upper Miocene part of the Segama Group unconformably overlies the Garinono Formation and is conformably overlain by the Bongaya Formation. This formation was investigated with detailed logging of outcrops and microfossils analysis in order to map the depositional facies and sedimentary environment. This study showed the presence of seven lithofacies: Thick amalgamated sandstone; thin, lenticular interbedded HCS sandstones and mudstone; laminated mudstone with Rhizophora; trough cross-bedded sandstone; laminated mudstone; strip mudstone with thin sandstone and siltstone; and interbedded HCS sandstone and mudstone. Based on the presence of Rhizophora, Brownlowia, Florchuetia sp., Polypodium, Stenochleana palustris, Ascidian spicule low angle cross bedding, very fine grained sandstone, thin alternations of very fine sandstone, silt and clay layers showing cyclicity (muddy rhythemites), rocks in the Sandakan Formation are interpreted as mangal estuary and open marine facies. Three facies associations could be deduced from the seven lithofacies: Gradual coarsening upwards shoreface; abrupt change facies and prograding estuary facies association.
Fosil radiolaria yang terawet dengan agak baik telah ditemui di dalam lapisan rijang yang tersingkap di km 38, lebuhraya Gua Musang-Cameron Highland, berdekatan dengan Pos Blau, baratdaya Kelantan, Semenanjung Malaysia. Sebanyak 20 spesies fosil radiolaria telah dikenal pasti. Spesies ini mewakili zon himpunanPseudoalbaillella globosa yang menunjukkan usia (Roadian) Awal Perm Tengah. Zon himpunan radiolaria ini merupakan rekod biostratigrafi yang baru untuk jujukan batuan bersilika di Pos Blau dan di dalam Zon Sutura Bentong-Raub.
This sedimentary logging and facies characterized dataset of 28 outcrops exposed along Kuala Tahan - Kampung Pagi - Kampung Bantal which is situated in the central part of Peninsular Malaysia (in the state of Pahang). This dataset is recorded in 2017 during the construction of roadway. It consist of Mangking Formation of Tembeling Group with the total length of 410 m. The outcrops are arranged into 8 continuous sections. This data can be further correlated stratigraphically to produce composite log, facies analysis, depositional processes, and the depositional environment.