【摘要】 <正> 海南岛石碌地区的笔石是1975年发现的,南颐曾经报道笔者等鉴定的两个种:Dictyonema sp., Tylograptus sp.,当时认为是奥陶纪的。1976年至1977年,笔者等在三棱山组的下部黑色含炭粉砂质泥岩中,采获很多笔石标本,经研究全部都是网格笔石(Dictyonema),未见Tylograptus。后来在笔石层下发现植物化石Neuropteris sp., ? Pecopteris sp. 和? Rhodeopteridium sp.更多还原

【Abstract】 The Graptolites described in the present paper were collected in 1976—1977 by the writers from the Sanlingshan Formation at Sanlingshan of Shilu, Hainan Island. Five species belonging to the genus Dictyonema may be recognized. They are: Dictyonema ex gr. fraiponti Ubaghs, D. shiluense (sp. nov.), D. hainanense sp. nov., D. sp. and D. ? sp.. Associated with the graptolites are Neuropteris sp., ?Pecopteris sp. and ?Rhodeopteridium sp., etc. all indicating a late Early Carboniferous age. The discovery of these Carboniferous graptolites makes it possible to establish a Carboniferous graptolite sequence in China. In the general aspects, they are similar to the Ordovician forms. It seems that in the genus Dictyonema the rhabdosome, stipes and dissepiments were unchanged conspicuously, but the thecae possibly were evolved in their structures from Late Cambrian to Early Carboniferous.更多还原