内蒙古哲斯敖包茅口期生物礁特征

内蒙古哲斯敖包茅口期发育典型的生物礁。礁体呈东西向展布,在空间上可明显地划分出后礁相、礁核相及前礁相。礁核相包括礁坪带、礁冠带和礁前缘带。各相带相互位置关系表明当时礁体南侧为滨岸方向,北侧为广海方向。礁体中化石极为丰富,可识别出不同的生物组合。生物组合的空间分布明显受生物礁相带控制,它们之间均为横向关系,反映了生物组合与水动力环境的统一性。

Characteristics of the Maokou'an Reef in the Zhesiaobao, Inner Mongolia

Typical reefs are discovered in the Maokou'an deposits of Zhesiaobo, Inner Mongolia. They extend from east to west, and can be divided into backreef facies, reef front facies and reef core facies clearly. Reef flat, reef crest and reef front margin can be recognized in the reef core facies. The relationship among the various facies suggests that southern part of the reefs are landward, and the northern part seaward. The reefs are very rich in fossils, in which different bioassemblages can be distinguished. The spatial distribution of those assemblages seems to be controlled by facies belts of reefs, and they may exchange laterally from one to another.