ArticleAuthors: Racheboeuf, Patrick R.; Janvier, Philippe; Ta, Hoa Phuong; Vannier, Jean; Shang-Qi, Wang (2005)
Additional vertebrates and ostracods from the bituminous shale of the Khao Loc Formation at Tong Vai, Ha Giang Province, northern Vietnam, corroborate its correlation with the upper part of the Xishancun (Xiaxishancun) Formation and the lower part of the Xitun and Lianhuashan formations of South China, and its Middle to Late Lochkovian age. The variations in morphology and ornamentation of the galeaspid Polybranchiaspis liaojaoshanensis from Tong Vai are discussed and regarded as possibly size and growth-related. A new acanthothoracid placoderm with a very deep dorsal process is described from Tong Vai and the specific distinction between the antiarchs Minicrania lissa from Tong Vai a... 
![Geobios Volume 38 issue 4 2005 [doi 10.1016%2Fj.geobios.2004.01.002] Patrick R. Racheboeuf; Philippe Janvier; Ta Hoa Phuong; Jean Van -- Lower Devonian vertebrates, arthropods and brachiopods from nor.pdf.jpg](/retrieve/5ec2c830-0988-475e-8fb6-768a4556fa43/Geobios%20Volume%2038%20issue%204%202005%20%5bdoi%2010.1016%252Fj.geobios.2004.01.002%5d%20Patrick%20R.%20Racheboeuf%3b%20Philippe%20Janvier%3b%20Ta%20Hoa%20Phuong%3b%20Jean%20Van%20--%20Lower%20Devonian%20vertebrates%2c%20arthropods%20and%20brachiopods%20from%20nor.pdf.jpg)