A DISCOVERY OF EARLY CRETACEOUS SPOROPOLLENS IN ZHENPING COUNTY OF HENAN PROVINCE AND ITS SIGNIFICANCE
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摘要: 本文首次论述了河南镇平早白垩世白湾组的孢粉组合面貌及其特征。根据孢子花粉属、种的垂直分布,自下而上把白湾组的孢粉组合可分为两个亚组合。下亚组合以Classopollis-Scneoisporiles为特征;上亚组合以Clas-sopllis-Scizneoisporiles-Jugella-Cidricosisporiles为特征。根据孢粉组合特征,把白湾组的时代确定为早白垩世,并以下亚组合代表别里亚士期-凡兰今期,上亚组合代表欧特里期-巴列姆期。Abstract: For the firsttime,the paper describes the asssemblage and the features of the early Cretaceous sporo-pollens discovred in the Baiwan Formation,Henan Province. According to their vertical distributions of genera and families, the sporo-pollenassemblage in the Baiwan Formation can be divided in to two sub-assemblages from bottom to top. The lower one ischaracterized by classapollis-Schizacois parties while the upper one by Classsopollis-Schizaneoisporites-Jugella-Cicatricasisporites.Based on the assemblage features of the sporo-pollen,the age of the Baiwan Formation is ascertained as the Early Cretaceous,therefore,the lower sub-assemblage represents Berriasian-Valanginian,and the upper one represents Hauterivian-Barremian, respectively.
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