fossiles, shuch as radiolaria etc ., were collected from the strata assigned previously to the carboniferous in the area of danzhou-tunchang in central hainan, now the age of the strata has been determined to be early-mid permian which divided into two parts 摘要在海南岛中部檐州屯昌地区前人划归石炭系地层中采获放射虫等古生物化石,新厘定出一套二叠系地层。
except for plenty of ammonite fossiles, abundant coccotithophorid is also found but simple species variation . therefore, we put forward that black shale deposition, especially the oil shales may have the relationship with the bloom of coccotithophorid of palaeo-oceanographical phytoplankton cn原于比与6’七toc曲线的变化趋势一致,说明5’七toc异常受到有机质组分变化的控制,即受陆源高等植物与海洋水生生物相对输人量的变化所控制。