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Paratirolites-Tapashanites fauna associated with Palaeofusulina sinensis and smaller foraminifers of the Dorashamian (Upper Permian) is collected from the Huai Thak Formation distributing at Doi Pha P...hlung, Lampang district of northern Thailand. The minor fault forms the boundary between the Huai Thak and the Lower Triassic Phra That Formations. Some ophiceratid ammonoids and Claraia are found in the lowermost horizon of the Phra That Formation. The Permian Huai Thak Formation is composed of clastic and calcareous sediments with intercalation of chert and tuff, and is estimated to be 1,100m thick. The uppermost shale bed of the formation, about 10m below the P/T boundary, yields Paratirolites nakornsrii, Tapashanites yaowalakae sp. Nov., Pseudogastrioceras aff. szechuanense and Xenodiscus? sp. The Lower Triassic ammonite, Ophiceras sakuntala Diener is recognized at the lowest bed 1m above the boundary, and several species of Claraia are also found about 20m above. Those faunas suggest the Otoceras woodwardi Zone of the lower Griesbachian. Palaeofusulina sinensis, Reichelina aff. changhsingensis, smaller foraminifers and Waagenophyllum aff. virgalense are obtained from the Permian limestone at Doi Pha Phlung (Pha Phlung Mt.). The limestone sequence barren of fossils above the Palaeofusulina Zone exceeds the thickness of 100m. The contact between this limestone and the ophiceratid shale is not found in the area. The continuous calcareous bed below the Palaeofusulina Zone yields Pseudophillipsia (Nodiphillipsia) aff. ozawai, Gallowainella meitienenisis, Siamnautilus ruchae gen. et sp. Nov., and many brachiopods including Oldhamina squamosa. The shale bed of the Paratirolites-Tapashanites fauna apparently looks stratigraphically higher than the limestone bed of the Palaeofusulina one in the area, but the latter represents a related heteroic facies of the former. A new genus and spicies of nautiloid, Siamnautilus ruchae, a new species of ammonoid, Ophiceras sakuntala are described in this paper.show more
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