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。
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.
出处
《北京地质》
1994年第3期1-9,共9页
Beijing Geology
关键词
坨里组
孢粉组合
早白垩世
地层
ToLi Formation,Palynological assemblage,early cretaceous
