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 摘要在海南島中部檐州屯昌地區(qū)前人劃歸石炭系地層中采獲放射蟲等古生物化石,新厘定出一套二疊系地層。
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原于比與6’七toc曲線的變化趨勢一致,說明5’七toc異常受到有機質(zhì)組分變化的控制,即受陸源高等植物與海洋水生生物相對輸人量的變化所控制。