The result showed that the organic materials of source rock were derived from the blooming phytoplankton and the products of frequent bacteria activities in Eopaleozoic.
The acritarchs at the depth 20202060m obtained from the well Hai4 in the Tonghaikou area of the Jianghan basin,Hubei province are totalled up to 22 genera,29 species,including 4 comparative, 2 new and 10 unknown speciesThe forms of acritarchs are known only from early Ordovician of Southwest China which provide,undoubtedly,significant evidence for seeking the microphytoplanktonic(acritarchs) distribution and paleogeographic position of the Yangtze platform during the early Ordovician epoch
Iron, which could help phytoplankton grow rapidly, is a micronutrient essential to the synthesis of enzymes required for photosynthesis in the oceanic environment.
The extinction event occurred during the Frasnian-Famennian (F-F event) has been recognized as a global event. At the end of the Frasnian stage there was an extinction of animals on a huge scale in the shallow seas covering much of the continental areas of the world. Most members of the animals, such as corals, stromatoporoids, brachiopoids, trilobites, tentaculitids, and ammonoids went extinct. The horizon of the event is in the gigas-triangularis zonal interval. Three causes have been suggested for this e...
The new acritarch forms dealt with in this paper are obtained from the lower part of the lower Ordovician Dawan Formation in Huanghuachang Section of Yichang ,Hubei. Three new genera, Papilliferum gen. nov., Stelomorpha gen. nov. and Yichangia gen. nov., and 2 new species,Papilliferum irregulare gen. et sp. nov. and Yichangia biporosa gen. et sp. nov.,are described. In addition,the diagnoses of three forms, Aremoricanium erchunensis Fang, Gorgonisphaeridium rhabdocladium Lu and G. striatum Lu, reported pre...