Biostratigraphical studies of radiolarians and conodonts in chert formation of Thailand and Malaysia

1990年11月和1991年12月，我们在泰国和马来西亚进行了实地调查。我们尝试在上述两个国家采集了中古生代至早中生代地层的微体化石。我们在这份中期报告中简要描述了微体古生物调查1)泰国北部的放射虫：我们从“Fang Chert”(Bunopas)采集了硅质岩和硅质页岩的样品。(1981年)。我们将晚泥盆世至早二叠世的放射虫与泰国东北部的放射虫区分开来：我们在班白庄附近出露的一系列带绿色的页岩和硅质岩中发现了晚泥盆世至早石炭世的放射虫。3)泰国南部的放射虫：保存完好的中三叠世早期放射虫和牙形石是从位于Phatthalungkao Chiak出露的层状石灰岩中获得的。这些微古生物证据对于了解东南亚的古地理和构造发展至关重要。来自马来西亚的岩石样本正在准备中。

In November and December of 1990 and 1991, we took field survey in Thailand and Malaysia. We attempted to collect microfossils from the Middle Paleozoic to Early Mesozoic strata in the mentioned two countries. We described briefly micropaleontological Investigation In this interim report.1) Radiolaria from northern Thailand : We collected samples of chert and siliceous shale from the "Fang Chert" (Bunopas. 1981). We discriminated the Late Devonian to Early Permian radiolarians.2) Radiolaria from northeastern Thailand : We found Late Devonian to Early Carboniferous radiolarians from a sequence of greenish shale and chert which crop out near Ban Pak Chom. Furthermore, we discovered well preserved Late Devonian radiolarians from black cherts exposed along the Pak Chom-Loei Road and an abandoned manganese quarry of Phu Song.3) Radiolaria from southern Thailand : Well preserved early Middle Triassic radiolarians and conodonts were obtained from the bedded limestone exposed at Khao Chiak near Phatthalung.These micropaleontological evidences are vital to the understanding of the paleogeography and tectonic development of Southeast Asia.Rock samples from Malaysia are now in preparation.