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本文记述了鄂尔多斯盆地西南部志丹群的孢子和花粉。根据孢粉组合特征划分出两个孢粉组合,其中一个组合产自环河-华池组上段,另一个组合产自泾川组,经与已知资料分析对比,前者时代确定为早白垩世早期,后者时代为早白垩世早中期。探讨了两个孢粉组合所反映的古气候环境,指出沉积区在环河-华池组上段沉积时为亚热带偏湿的气候,并在某种程度上受干旱气候的控制,泾川组沉积时为热带、亚热带偏干旱气候。对孢粉植物群分区问题做了论述,说明研究区志丹群的孢粉植物群应归于G.F.Herngreen和A.F.Chlonova(1981)划分的北极-欧州亚省(Boreal-European)。文中描述了五个新种:Divisisporites palmatus sp.nov.,Biretisporites minor sp.nov.,Camarozonosporites scabratus sp.nov.,Piceaepollenites minutus sp.nov.和Ina-perturopollenites plicatus sp.nov.。
This article describes the spores and pollen of the Zhidan population in the southwestern Ordos Basin. According to the characteristics of sporopollen assemblages, two sporopollen assemblages were identified, one of them was from the upper part of Huhuan-Huachi Formation and the other from Jingchuan Formation. Compared with the known data, the former age was identified as Early Cretaceous Early, the latter era of Early Cretaceous early. The palaeoclimate environment reflected by the two sporopollen assemblages is discussed. It is pointed out that the sedimentary region is a subtropical humid climate when it is deposited in the upper Huanghuai-Huachi Formation, and is controlled to some extent by arid climate. The deposition of the Jingchuan Formation When tropical, subtropical drought climate. The problem of the division of the pollen flora was discussed, indicating that the pollen flora of the Zhidan group in the study area should be attributed to the Boreal-European division by G.F. Herngreen and A.F. Chlonova (1981). Five new species are described in the text: Divisisporites palmatus sp. Nov., Biretisporites minor sp. Nov., Camarozonosporites scabratus sp. Nov., Piceaepollenites minutus sp. Nov. And Ina-perturopollenites plicatus sp. Nov.