TWO ECOLOGICAL PATTERNS OF THE PERMIAN AMMONOIDS

• 作 者: 周祖仁
• 机 构: Nanjing Institute of Geology and Paleontology, Academia Sinica
• 出 处: Science in China,Ser.B
• 发表日期: 1986年01期
• 关键词: Permian facies shallow strata environments evolved realm restricted divide sedim

This paper attempts to divide the Permian ammonoids and the paleogeographical environments into two ecological patterns, the restricted sea pattern and the open-sea pattern. The former represents a new shallow-water pattern which evolved within the epicontinental sea with some barriers. It has been emphasized that the differances in facies should be considered in making regional correlation of the ammonoid-bearing strata.

This paper attempts to divide the Permian ammonoids and the paleogeographical environments into two ecological patterns, the restricted sea pattern and the open-sea pattern. The former represents a new shallow-water pattern which evolved within the epicontinental sea with some barriers. It has been emphasized that the differances in facies should be considered in making regional correlation of the ammonoid-bearing strata.