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标题：Larger benthic foraminifera occurrence from early Miocene limestone of Setap Shale formation at Batu Luang, Klias Peninsula, Sabah, Malaysia
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作者：Junaidi Asis ; Sanudin Hj. Tahir ; Basir Jasin 等
期刊名称：International Research Journal of Earth Sciences
电子版ISSN：2321-2527
出版年度：2018
卷号：6
期号：10
页码：12-19
语种：English
出版社：International Science Community Association
摘要：Limestone unit of Setap shale formation was physically exposed at Batu Luang, Klias Peninsula, Sabah. The limestone consisted of well-preserved Larger Benthic Foraminifera (LBF). The study of its petrography, biostratigraphy and paleoenvironment gave some significance to the age and deposition paleoenvironment of the sediment. In addition, the impact and implication to the stratigraphy of Shale Setap in Klias Peninsula was thus of recent discovery. The objectives of this study were then to identify and classify the taxonomy of the larger benthic foraminifera species found in the limestone, besides determining the age and paleoenvironment of the limestone facies. Field observations carried out at the shoreline coast showed that the limestone color was grey, and consisted of encrusting coral at lower part of the bed, while the upper part was mostly massive limestone, rich in larger benthic foraminifera. The limestone lenses could be seen at the mudstone bed with some mudstones showing hummocky cross-stratification. Laboratory petrographic and fossils analyses were conducted from three samples of limestone collected. Thirty of thin section samples were prepared based on the standard procedure of the petrography analysis, and fossil classification were done using polarised microscope and photographed by using high performance camera. Species of LBF were identified with relation to the age assemblage, and environment. Eleven species of larger benthic foraminifera were identified i.e. Austrotrilina sp., Cycloclypeus sp. Lepidocyclina (Eulepidina) sp. Lepidocyclina (Nephrolepidina) acuta, Lepidocyclina (Nephrolepidina) parva, Lepidocyclina (Nephrolepidina) sumatrensis, Lepidocyclina (Nephrolepidina) verbeeki, Miogypsinoides sp., Miogypsinoidesdehaarti, spirocyclopeus sp. and Tansinhokellasp. Based on field observation, foraminifera analysis and environmental deposition, the foraminifera LBF limestone assemblage units of Batu Luang were found to be the remnants of bioherm that were indicative of Te5 or Early Lower Miocene (Aquitanian) age which were much older than other previous researches.
关键词：Larger benthic foraminifera;early Miocene;setap shale formation;klias peninsula;petrography