Biostratigraphic Study of Paleozoic and Mesozoic Groups in Central and Northern Thailand

该项目的主要目的概述如下：泰国二叠纪古生物地理的划分，主要包括三个地区：（1）南邦-帕尧地区，（2）角三郎-碧差汶地区，（3）泰国二叠纪古生物地理的划分。Loei-Pak Chom地区。在Lampang-Phayao地区，最上层的二叠纪菊石，如Pseudogastrioceras sp.，Paratirolites sp.nov.，和Paraceltites？在一个风化泥岩中发现了一个新的化石层，其中包括一个新的化石层，其中包括一个新的化石层，以及一个新的化石层。此外，还从覆盖在含铵泥岩上的石灰岩中识别出了一些具有代表性的上二叠统有孔虫。还在邻近地区研究了三叠纪腕足动物。在该地区建立包括二叠纪-三叠纪界线在内的地层序列是非常有希望的。在Kok Sam Rang-菲查本地区中二叠统灰岩和裸岩分布广泛，石炭纪和志留纪裸岩也分布在Loei-Pak Chom地区，在这些地区获得了种类繁多、数量丰富的化石。这对探讨志留纪和二叠纪的古环境变化和古生物地理有重要意义。

The main purposes of this project are summarized as follows;1,establishment of biostratigraphy and correlation of the uppermost Permian and lower Triassic,and 2,ezamination of the Permian palaeobiogeography in Thailand.The surveyed regions are represented by three areas,namely(1),Lampang-Phayao area,(2),Kok Sam Rang-Phetchabun area,and(3),Loei-Pak Chom area.In the Lampang-Phayao area the uppermost Permian ammonoids such as Pseudogastrioceras sp.,Paratirolites sp.nov.,and Paraceltites? sp.were investigated from a weathered mudstone.In addition to them some representative Upper Permian foraminifers were also discriminated from a limestone which overlies the ammonoid-bearing mudstone.Triassic brachiopods were also investigated from a neighbouring locality.Establishment of the stratigraphic succession including the Permo- Triassic boundary will be strongly expected in this area.In the Kok Sam Rang-Phetchabun area Middle Permian limestones and nudstones widely distribute,and the Carboniferous and silurian nudstones are also distributed in the Loei-Pak Chom area.Many kinds and abundant fossils were obtained from these areas. They are very useful for discussing the change of palaeoenvironments and palaeobiogeography during Silurian and Permian.