Abstract
Abstract A new occurrence of the widespread latest Ashgill (Hirnantian) Hirnantia shelly fauna is documented from the Wang Tong Formation of Satun Province, southern Thailand. Neighbouring faunas are revised, including Mucronaspis malayensis, which proves different from the Hirnantian M. mucronata and is the only known post-Ordovician occurrence of the genus. The Thai fauna is essentially identical to that from the Panghsa-pye Beds, Northern Shan States, Burma (Myanmar), and brachiopod species erected from the latter are senior synonyms of better known names. Both faunas and sedimentary sequences from the Caradoc to the Llandovery in south Thailand and the Northern Shan States are found to be extremely similar to those from South China, indicating that the Sibumasu (Shan-Thai) palaeocontinent, on which both Thailand and the Northern Shan States were situated in the Ordovician and Silurian, was closer to South China than previously supposed.
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