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

1990年11月和1991年12月，我们分别在泰国和马来西亚进行了实地调查。我们试图收集上述两个国家中古生代至早中生代地层的微化石。在这篇中期报告中，我们简要地描述了微古生物学的研究。1)来自泰国北部的放射虫（Radiolaria）：我们从“Fang chert”（bunoppas, 1981）收集了燧石和硅质页岩样本。我们区分了晚泥盆世到早二叠世的放射虫。2)来自泰国东北部的放射虫：我们在Ban Pak Chom附近的绿色页岩和燧石岩序列中发现了晚泥盆世至早石炭世的放射虫。此外，我们在Pak chomo - loei路和Phu songa废弃的锰矿石中发现了保存完好的晚泥盆世放射虫。3)泰国南部的放射虫：在Phatthalung附近的Khao Chiak出土的层状石灰岩中发现了保存完好的中三叠世早期放射虫和牙形刺。这些微体古生物证据对认识东南亚古地理和构造发育具有重要意义。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.