| 北京地区的白垩系 |
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| 引用本文： | 萧宗正,杨洪连.北京地区的白垩系[J].地层学杂志,1991,15(2):100-108,144. |
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| 作者姓名： | 萧宗正 杨洪连 |
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| 摘 要： | <正> 北京地区的白垩系主要出露于西山坨里—大灰厂一带,层序清楚,化石丰富,为华北晚期中生代著名的陆相断陷沉积盆地之一(图1)。坨里—大灰厂白垩系沉积盆地位于华北地台燕山台褶带西山拗陷区之东南缘。盆地北、西缘为著名的八宝山—南大寨与黄庄
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| 关 键 词： | 白垩纪 北京 地层 古生物 |
The Cretaceous of the Beijing area |
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| Abstract: | The Cretaceous system of the Beijing area is chief distributed in the region of Tuolid-Dahuichang.It is a well-known graben basin of the Late Mesozoid continental deposits in northern China.The Cretaceous system in this area can be divided into the following 2 groups and 6 formations: the Fangshan Group (the Xiazhuang, Lushangfen and Tuoli Formations) and the Fengtai Group (the Xinzhuang, Dahui-chang and Donglanggou Formations).The Rehol biota contains the well-known Eoscstheria-Ephemeropsis-Lycoptcra Assemblage (EEL).Some elements of the Rehol biota began to appear in the Donglanggou Formation and were flourishing in the Dahuichang Formation.The common members of the Rehol biota, such as Eosesthcria, Diesthcria, Ephcmeropsis, Lycoptcra, Fcrganoconcha, Probaicalia and Nakamuranaia, were extinct before the Tuoli age in this region The Fanshan biota mainly appears jn the Tuoli, Lushangfen and Xiazhuang Formations and may be divided into two assemblages.The early assemblage is characterized by the abundant fossil plants and insects and ranges in age from Tuoli to Lushangfen.The late assemblage mainly appears in the Xiazhuang Formation containing abundant bivalves, gastropods, conchostracans, ostracodes, plants and sporo-pollen, with mollusks and ostracodes especially abundant and ranges in age from middle to later Early Cretaceous. |
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