宁夏石炭纪、早二叠世孢子带和石炭─二叠系界线

宁夏中宁、中卫地区石炭系和二叠系地层发育，化石丰富，是我国石炭—二叠系地层重要研究地区。首次系统的孢粉地层学研究，共发现６０余属、１８Ｏ余种孢子和花粉。根据孢子花粉在地层中演化规律，可划分出１０个孢粉组合带，其中石炭系８个带，下二叠统２个带。中宁、中卫地区石炭系和下二叠统孢粉组合带可与甘肃靖远和华北地区同时代孢子带比较，亦可与西欧，北美和前苏联有关孢子带对比。中宁、中卫地区石炭系和下二叠统孢粉带的研究不仅有重要地层学和古生物学意义，而且对该地区石炭系和石炭—二叠系界线划分与对比有重要意义，对研究华北地台和祁连褶皱带之间关系以及沉积环境和古地理的研究也十分重要。

CARBONIFEROUS AND EARLYPERMIAN SPOREZONATIONS AND THE BOUNDARY OF THE CARBONIFEROUS -PERMIAN IN NINGXIA

The Carboniferous and Early Permian are widespread in Ningxia and yielding abundant remains of fauna and plants. One hundred and eighty spore of miospores and acritarchs,distribution amongst 60 genera,are indentified. As a result of the extensive studies of the spore zonations from the Carboniferous and Early Per-mian in Ningxia. It may be subdivided into ten spore zonations,1-8 zonesbelong to the Carboniferous and others in the Early Permian.To ascend stratigraphic order these are:10.Potonieisporites bharadwa ji-Strialatosporites shanxiensis(BS)zone 9.Sinulatisporites sinensis-Gulisporites cochlearis(SC)zone 8.Striatosporites major-Spinosporites spinosus(MS)zone 7.Thymospora thiessenii-Florinites junior(TJ)zone 6.Dictyotriletes bireticulatus-Torispona securis(BS)zone 5.Radiizonates aligerns-Triquitrites sinani(AS)zone4.Densosporites reticulatus-Grumosporites varireticulatus(RM)zone3.Crassispora kosankei-Murospora Kosankei(kk)zone2.Savitrisporites nux-Rotaspora knoxi(NK)zone 1.Tripartites vetustus-Rotaspora fracta(VF)zone The spore zonations of Ningxia may be correlated basically with those in China,Western Eu-rope,U.S.S.R. ,North Africa and North America.Based on the palynological data,the boundary of the Carboniferous and Permian,the reconstruc-tion of paleogeography and paleoecology are discussed.