Middle Carboniferous cephalopods from Loei area, northern Thailand

Abstract

The Carboniferous cephalopods are abundantly recognized at "Barite Mine", northern part of Loei-city, northern Thailand. The fauna of "Barite Mine" consists of various taxa such as cephalopods, brachiopods, corals, bivalves and gastropods etc. More than three hundreds specimens of cephalopods consisting of ammonoids, nautiloids and orthoceratids are collected and are replaced by barite minerals. Five genera of ammonoids and five genera of nautiloids are identified at present. In addition to these, one new genus and two new species of ammonoid are included. The identified cephalopod species are as follow s; Branneroceras branneri , Diaboloceras inuolutum, Syngastrioceras sp., Neogastrioceras sp. , Bisatoceras sp., Catastroboceras subsulcatifomae, Epidomatoce ras doohylense, Gzheloceras sp, Temnocheilus sp., and Epistroboceras sp. These cephalopod fauna indicates the age from Namurian to Moscovian of the Middle Carboniferous. This fauna is very important to construct the biostratigraphy based upon the Paleozoic ammonoid zones in Southeast Asia.

New Species of Coiled Nautiloids From the Pennsylvanian of the Donets Basin, Ukraine

“…nov. (Bashkirian); 10 -G. sp. (Bashkirian) [9]; 11 -G. sp. (Kasimovian) [15]; 12 -G. nikitini ( Tzwe t a e va , 1 8 8 8 ) (Gzhelian) [23,25]; 13 -G. sp.…”