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The Paleozoic formations in Thailand are distributed at northern and peninsular parts of the country. The geological survey was carried around Loei, Changwat Loei, northeast Thailand and some Permian ...ammonoids and fusulinids were collected from the E-Lert Formation of the Saraburi Group and only the former systematically described in this paper. The ammonoid and fusulinid species recognized from silicious shale and limestone from 4 localities are as follows; A gathiceras aff. suessi GEMMELLARO, Propinacoceras sp., Artinskia loeinsis sp. nov., Properrinites boesei (PLUMMER and SCOTT), Popanoceras sp., Parafusulina multiseptata (SCHELLWlEN), Pseudodoliolina ozawai YABE and HANZAWA, Monodiexodina sp., Chusenella sp., Schubertella sp. and Triticites sp. The geological age based on these fossils in the surveyed areas are considered as early Middle Permian. The exotic block or body of limestone and calcareous shale in the Huai I-Loet Formation indicates the same or older geological ages as follows; Locality 1-middle Early Permian (Sakmarian), Locality 2-early Middle Permian (Bolorian) and Locality 4-early (Asselian) to middle Early Permian (Sakmarian). The fusulinid fossils have been reported from a number of localities in Thailand, and the biostratigraphic correlation in the Upper Paleozoic has been depended on the fusulinid fossils. On the other hand, the ammonoid biostratigraphy is very useful for the international correlation of the non-calcareous sediments. Those ammonoids except for Agathiceras aff. suessi GEMMELLARO and Propinacoceras sp. are reported from Thailand for the first time. Properrinites boesei (PLUMMER and SCOTT) and Artinskia loeiensis sp. nov. are also reported from the Indochina regions for the first time.show more
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29_02_p175