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

本研究的主要目的是：(1)建立上二叠统和下三叠统的生物地层学和对比；(2)研究泰国二叠纪古生物地理。被调查地区由以下三个地区代表：即(1)南邦地区，(2)洛伊（&庆坎）地区，(3)春蓬-素拉斯他尼地区。在南邦地区，分别从不纯灰岩和泥岩中研究了上二叠统和下三叠统的菊石。该地区二叠纪和三叠纪的界线上有一条断裂，但动物断裂似乎不太明显。在洛伊（&庆坎）地区，从灰岩和泥岩中发现了下二叠统、上石炭统和泥盆纪的化石。在春蓬-苏拉斯塔尼地区，对生物礁灰岩中的三叠纪珊瑚和腕足类进行了研究。腕足动物区系与南邦地区密切相关。研究了二叠纪、石炭纪腕足类和腕足类。这些动物对研究亚洲特提斯南缘晚古生代和中生代早期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.