Cao Bang brickyard, Cao Bang Province, northern Vietnam; Na Duong Formation, Palaeogene [details]
Na Duong coalmine, Lang Son Province, northern Vietnam; Na Duong and Rinh Chua formations, Palaeogene [details]
Cao Bang brickyard section, Cao Bang, northern Vietnam; Na Duong Formation, Palaeogene [details]
Cao Bang brickyard, Cao Bang Province, northern Vietnam; Na Duong Formation, Palaeogene [details]
Na Duong coalmine, Lang Son Province, northern Vietnam; Na Duong Formation, Palaeogene [details]