海南岛屯昌南棍园含疑源类化石地层时代的厘定OA

[Objective]It has been controversial regarding the stratigraphic division and depositional timing of the slightly metamorphosed fine clastic rock series exposed in the area from Danzhou to Tunchang in central Hainan Island.[Methods]In this paper,samples of microfossils from multiple layers of the slightly metamorphosed fine clastic rock series in the Nangunyuan section of Tunchang have been collected,and acritarch fossils obtained from four of them.[Results]The acritarch fossils obtained mainly include Leiosphaeridia,Asteridium,Pterospermopsis,Lophosphaeridium,and Dictyotidium.Regional comparison indicates that the age of the fossil-bearing strata should be between the late Neoproterozoic and the earliest Cambrian,rather than the Permian,Carboniferous,or Silurian as previously proposed.[Conclusions]This paper confirms,for the first time,the existence of strata from the late Neoproterozoic to the earliest Cambrian in the area north of Changjiang-Baisha in Hainan Island.