The shutdown of carbonate productivity and its replacement by black shale deposition is often observed in the geological record yet factors driving such a change are debated. latest Famennian western Laurentia (present day North America) provides good example limestone – transition that roughly contemporaneous with global Hangenberg Crisis series environmental biotic changes associated widespre...

Palynological investigations have been carried out on samples from the Upper Devonian Hongguleleng Formation of Western Junggar, Xinjiang, NW China. In total, 26 miospore species belonging to 19 genera and 28 acritarch assigned recognized lower member Fm. in Bulongguoer section. The palynofloral assemblages, particular taxa, are similar those eastern European early Famennian Corbulispora vimine...