Posidonomya is common in the Kubang Pasu and Singa Formations in northwest Peninsular Malaysia. It was discovered from the red mudstone layers (redbeds) in many localities in Langkawi Islands, Perlis and Kedah. Previous studies suggested that the age of Posidonomya ranged from Middle Devonian to Carboniferous. Posidonomya beds in Kedah and Perlis are located above the Tournaisian radiolarian chert layers. The age of Posidonomya from Peninsular Malaysia is comparable to those of Europe, Morocco, Turkey and South China which range from Tournaisian to Serpukhovian, Early Carboniferous. The fossil specimens exhibit morphological features closely related to Posidonomya becheri Bronn. Two taxa were identified namely Posidonomya becheri Bronn and Posidonomya cf. kochi (von Koenen). The occurrence of Posidonomya indicates that the age of the lower part of the Kubang Pasu and Singa Formations is Early Carboniferous. Its geographic distribution formed a wide paleobiogeographic province in the Paleo-Tethys. The province was located in the warm tropical-subtropical climatic zone. Therefore, Posidonomya can be a good indicator for warm climate. Its wide distribution and short stratigraphic range make it a good index fossil for the Early Carboniferous.
Chemical compositions, and radiolarian content of several Late Paleozoic and Mesozoic chert samples have been studied. The occurrence of radiolaria in the chert permits dating of the rock more accurate. The age of the Kubang Pasu chert is Early Carboniferous. The age of the Kodiang chert is CarnianÂNorian, Late Triassic. The age of the Semanggol chert ranges from Late Permian to Middle Triassic. The cherts from Ulu Kelantan and Jengka area I are dated as Early Permian and late Permian respectively. Three lithologic I associations are recognised; 1) chert-limestone association represents a subsidence association which is found at the Kodiang Formation, 2) chertclastic association represents continental margin chert association which is very common in Peninsular Malaysia. It is found in the Semanggol Formation, Kubang Pasu Formation, and the chert from Ulu Kelantan, and 3) chertpyroclastic association which represents island-arc association is found in the chert at the Jengka area, Pahang.
Beberapa contoh rijang berusia Paleozoic Akhir dan Mesozoik telah dikaji kandungan kimia, dan radiolaria. Kewujudan radiolaria dalam bantuan rijang telah membolehkan penentuan usia yang lebih jitu terhadap lapisan rijang di beberapa formasi batuan di Semenanjung Malaysia. Rijang Formasi Kubang Pasu berusia Karbon Awal. Rijang Formasi Kodiang berusia Karnian Norian, Trias Akhir. Rijang Formasi Semanggol berusia Perm Akhir hingga Trias Tengah. Rijang di kawasan Ulu Kelantan berusia Perm Bawah. Rijang di kawasan Jengka, Pahang berusia Perm Akhir. Tiga sekutuan batuan rijang telah dikenalpasti; 1) sekutuan rijang-batu kapur atau dikenali sebagai sekutuan ambelesan yang didapati di Formasi Kodiang, 2) sekutuan rijangÂbatuan klastik atau dikenali sebagai sekutuan rijang pinggir benua, sekutuan ini banyak ditemui di Semenanjung Malaysia terutama dalam Formasi Semanggol, Formasi Kubang Pasu dan rijang di Ulu Kelantan dan 3) sekutuan rijang-piroklastik atau dikenali sebagai sekutuan arka-kepulauan didapati pada batuan rijang di kawasan Jengka, Pahang.
Miocene larger benthic foraminifera have been discovered from a limestone unit of the Kalumpang Formation. The limestone is exposed at the Teck Guan Quarry, Tawau, southeast Sabah. The Kalumpang Formation consists predominantly of interbedded mudstone and sandstone (graywacke), conglomerate, limestone, marl, chert and volcanic rocks. Five limestone samples have been collected and processed for petrographic analysis and identification of larger benthic foraminifera. The limestone is classified as packstone and mudstone. A total of seventeen species of larger benthic foraminifera have been identified. The foraminifera are divided into two assemblages namely Assemblage I and Assemblage II. Assemblage I is characterized by the presence of Lepidocyclina (Nephrolepidina) parva, Operculina sp. and Lepidocyclina (Eulepidina) formosa. This assemblage is an indicative of Aquitanian to Burdigalian in age (Early Miocene). Assembalge II comprises of Lepidocyclina (Nephrolepidina) sumatrensis, Lepidocyclina (Nephrolepidina) angulosa, Lepidocyclina (Nephrolepidina) ferreroi Lepidocyclina sp., Miogypsina sp., Katacycloclypeus annulatus, Katacyloclypeus martini, Cycloclypeus carpenteri, Cycloclypeus indopacificus, Cycloclypeus sp., Flosculinella bontangensis, Operculina complanata, Amphistegina bowdenensis and Amphistegina sp. This assemblage is an indicative of Langhian to Serravallian age (Middle Miocene). The foraminiferal assemblages suggest that the depositional environment was a warm tropical shallow-marine at the fore-reef shelf zone.
The Kuamut Melange is located in the Kunak district, south east Sabah. The mélange consists of clasts and blocks of broken Paleogene formations and dismembered ophiolite blocks embedded in shale matrix. Fourteen samples were collected from sections S1 and S2 of the Kuamut Melange. A total of 45 species of radiolarians have been identified and only 36 selected species are used for age determination. Three assemblages (I-III) were identified. Assemblage I consists of dictyomitra
excellence, Crucella bossoensis, Hiscocapsa asseni, Hexapyramis precedis, Thanarla brouweri, Acanthocircus levis, Obeliscoites vinassai, Stichomitra communis, Staurosphaeretta longispina, Xitus spicularius, Triactoma cellulosa, and dactyliosphaera maxima. This assemblage is marked by the occurrence of Crucella gavalai indicative of Aptian to Albian in age. Assemblage II was characterized by zonal maker Xitus mclaughlini. Other species in this assemblage are Xitus
spinosus, Stichomitra tosaensis, dictyomitra gracilis, dictyomitra montisserei, Pseudodictyomitra pseudomacrocephala, Pessagnobrachia fabianii, Crucella messinae, Tuguriella pagoda, dictyomitra obesa, Triactoma paronai, Rhopalosyringiumeuganeum, Acanthocircus venetus, Acaeniotyle rebelis, dictyomitra formosa, Pseudodictyomitra tiara and Patellula helios. This assemblage ranges from Albian to Cenomanian. Assemblages III is represented by zonal maker Crucella cachensis and others species in this assemblage are Hemicryptocapsa polyhedra, Eostichomitra bonum, Pseudotheocampe tina, ultranapora cretacea and Alievium superbum. Assemblage III is Turonian in age. The radiolarian assemblages suggest that the age of chert blocks ranges from Aptian to Turonian, Cretaceous. The cherts were originally deposited on an oceanic crust of a marginal basin during Cretaceous and were tectonically deformed to form melange in Miocene time.
Fosil radiolaria berusia Perm Awal telah ditemui daripada batuan silika-rijang di Pos Blau, baratdaya Kelantan,
Semenanjung Malaysia. Sebanyak empat puluh spesies radiolaria tergolong dalam lima belas genera dan tujuh famili
telah dikenal pasti. Fauna radiolaria yang diperoleh termasuklah spesies penunjuk usia seperti Pseudoalbaillella
lomentaria, Ps. sakmarensis, Ps. scalprata scalprata, Ps. scalprata postscalprata dan Ps. scalprata rhombothoracata.
Kesemua radiolaria ini mewakili usia Perm awal merujuk kepada Zon Himpunan Pseudoalbaillella lomentaria
(Sakmarian Awal) dan Zon Himpunan Pseudoalbaillella scalprata m. rhombothoracata (Sakmarian Akhir). Keputusan
ini dapat menambah baik maklumat biostratigrafi radiolaria dan usia batuan bersilika-rijang di kawasan Pos Blau
dan di dalam Zon Sutura Bentong-Raub.