| 北京西山坨里组孢粉组合及其地层意义 |
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| 引用本文： | 常英,张清波.北京西山坨里组孢粉组合及其地层意义[J].城市地质,1994(3):1-9. |
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| 作者姓名： | 常英 张清波 |
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| 作者单位： | 北京市地质研究所 |
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| 摘 要： | 坨里组主要分布在北京西山坨里－大灰厂白垩纪沉积盆地的西部或西南部。是一套以砾岩为主的陆相碎屑沉积。含有丰富的动、植物及孢子花粉化石。孢粉组合是以Ｃｉｃａｔｒｉｃｏｓｉｓｐｏｒｉｔｅｓ－Ｄｅｎｓｏｉｓ－ｐｏｒｉｔｅｓ－ｃｌａｓｓｏｐｏｌｌｉｓ为代表，它们在组合中具有较高的含量，类型丰富多彩。根据组合中孢子和花粉的地层分布及国内外孢粉组合比较，定其时代为早白垩世早中期（凡兰吟—戈特里夫期）。气候为半干旱—干旱的热带。亚热带。
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| 关 键 词： | 坨里组 孢粉组合 早白垩世 地层 |
PALYNOLOGICAL ASSEMBLAGE OF TOLI FORMATION FROM WESTERN HILLS,BEIJING |
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| Chang ying,Zhang Qingbo.PALYNOLOGICAL ASSEMBLAGE OF TOLI FORMATION FROM WESTERN HILLS,BEIJING[J].City Geology,1994(3):1-9. |
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| Authors: | Chang ying Zhang Qingbo |
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| Institution: | Geological Institute of Beijing |
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| Abstract: | The Toli Formation is well devoloped in Toli-Dahuichang Basin.Abundance fossilsporo-pollens.The palynological assemblage of Toli Formation is characterized by comparative abundance of Cicatricosisporites and dominance of Classopollis,with various typical early Cretaceous elemeiits,such as Densoisporites,Lygodiumsporites,Concavissimisporites,Schizaeoisporites,Hsuisporites etc.Its age may be considered to be late Valanginian-Hauterivlan.The above assemblage reflect the climate of a dry-semidry subtropical-tropical zone. |
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| Keywords: | ToLi Formation Palynological assemblage early cretaceous |
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