摘要
1976年,我所对湘西南、桂东北中生代含煤地层与古生物群进行系统的调查。采集了大量的动植物化石和孢粉样品。在湖南零陵冯家冲、江永桃川、兰山园竹及广西贺县西湾等地的下侏罗统样品中,发现丰富的孢粉化石。对这些孢粉化石的研究,关于认识华南早侏罗世孢粉组合,以及确定华南早侏罗世地层之存在,具重要意义。赵鼎担任孢粉样品分析,毛继良摄制图影,徐宝瑞清绘插图,均致谢忱。
The Palynomorphs discovered from the Guanyintan Formation in southwestern Hunan and the Daling Formation in northeastern Guangxi may be assigned to 44 genera and 71 species,among which,11 genera including 1 new genus and 7 new species are described.The Guanyintang Formation can be divided in ascending order into the following 3 members:(1)Paijiachong Member,characterized by the predominance of the pollen grains of gymonospcrms(94.5%of the assemblage)together with the spores of pteridophytes(5.5%).The genus Classopollis of Cheriolepidiaceae plays an important role in this assemblage,totalling up to 35.6%and the presence of Chordasporites is worthy of note.Besides,there occur Chasmatosporites,Ginkgocycadophytus,Cycadopites,Quadraeculina.(2)Tabakou Member,characterised by the presence of Classopollis,which occupies 75.7%of this assemblage.Other elements are mostly the same as those of Paijiachong Member.But,noticeable,the species Annulispora microannulata,Concavisporites intrasttriatus,Lunzisporites regulatus Angiopteridaspora denticulata,Neoraistrickia taylorii,Hunanispora mirus,etc.made their first appearance in S.W China.(3)Fenjiachong Member,characterized by the predominance of Classopollis(51.7%).Both Ginkgocycadophytus and Cycadopites increase in number(7.8%).Anaplanisporites stipulatus,Anaplanisporites telephorus,Pilosisporites can be found only in this formation.The assemblage of Daling Formation contains pteridophytic spores(54.8%),including Cyathidites(31.1%),Dictyophyllidites and Concavisporites(17.5%).Annulispora perforta,Osmundacidites wellmanii,Conbaculatisporites sp.are diminutive,and Kyrtomisporis laevigatus is known as the relic element of Late Triassic.Among the pollen grains,Classopollis,Chasmatosporites and Ginkgocy-cadophytus exceeds 10%of the total member,whereas Disaccate pollen is meagre.All the three members of Guanyintan Formation may be referred to the Early Jurassic,The Daling Formation can be correlated with the Guanyintan Fation.
作者
尚玉珂
Shang Yu-ke(Nanjing Institute of Geology and Palaeontology,Academia Sinica)
出处
《古生物学报》
1981年第5期428-440,497-498,共15页
Acta Palaeontologica Sinica
