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 de-
 scribed in this paper.  The ammonoid and fusulinid species recognized from silicious
 shale and limestone from 4 localities are as follows; Agathiceras aff. suessi GEMMEL-
 LARO, Propinacoceras sp., Artinskia loeiensis sp. nov., Properrinites boesei (PLUMMER and
 SCOTT), Popanoceras sp., Parafusulina multiseptata (SCHELLWIEN), 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 (Bolo-
 rian) and Locality 4-early (Asselian) to middle Early Permian (Sakmarian).  The fusu-
 linid fossils have been reported from a number of localities in Thailand, and the
 biostratigraphic correlation in the Upper Paleozoic has been depended on the fusuli-
 nid fossils.  On the other hand, the ammonoid biostratigraphy is very useful for the
 international correlation of  tbe non-calcareous sediments.  These ammonoids except
 for Agathiceras all. 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.