Biostratigraphy and Palaeogeography of the Uppermost Permian and the Lower Triassic in the Southern Realm of the Asian Teths

该项目的目的概括如下：(1)建立上二叠统和下三叠统的生物地层学和对比；(2)泰国二叠系的古生物地理研究。调查地区由以下三个地区代表：(1)楠榜地区，(2)Loei(&Chiengkan)地区，(3)Chumpon-Surasthan地区。楠榜地区二叠系最上层菊石和下三叠统菊石分别来自不纯灰岩和泥岩。该地区二叠系和三叠系之间的界线被一条断层连接，但动物群的断裂似乎并不那么显著。在洛伊(&琼坎)地区，在石灰岩和泥岩中发现了下二叠统、上石炭统和泥盆系的化石。在Chumpon-Surasthan地区，在生物礁灰岩中发现了三叠纪珊瑚和腕足类。腕足类动物群与楠榜地区的腕足动物群关系密切。对二叠纪竹节类、石炭纪腕足类和翼足类进行了研究。这些动物群对研究亚洲特提斯南部晚古生代和早中生代的古环境和古生物地理变化具有重要意义。

The purposes of this project are summarized as follows, (1) establishment of biostratigraphy and correlation of the Upper Permian and Lower Triassic, and (2) examination of the Permian palaeobiogeography in Thailand. The surveyed areas are represented by the following three areas; namely (1) Lampang area, (2) Loei (& Chiengkan) area, and (3) Chumpon -Surasthani area. In the Lampang area the Uppermost Permian ammonoids and also the Lower Triassic ones are investigated from impure limestones and mudstones, respectively. The boundary between the Permian and Triassic is contacted by a fault in this area but the faunal break seems to be not so remarkable. In the Loei (& Chiengkan) area, the Lower Permian, Upper Carboniferous, and Devonian fossils are found from limestones and mudstones. In the Chumpon-Surasthani area Triassic corals and brachipods are investigated in the organic reef limestones. The brachiopod fauna is closely related with that of the Lampang area. Permian fusulines and Carboniferous brachiopods and pelecypods are investigated. These faunas are very important for examining the change of palaeoenvironment and palaeobiogeography in late Palaeozoic and early Mesozoic times in the southern realm of the Asian Tethys.