【摘要】 研究剖面位于西班牙西北部ASTURIAS地区 ,该区富含沟鞭藻化石 ,共发现沟鞭藻 4 5属 114种 ;在森诺曼 土仑 (Cenomanian Turonian)界线附近沟鞭藻的丰度、分异度显著降低 ,所作的指示环境的其他半定量数据在此也均有变化。通过研究对沟鞭藻所反映的古环境变迁进行了详细分析 ,证实在森诺曼 土仑期本区明显受到了全球缺氧事件的影响。更多还原

【Abstract】 The study section located in Asturias, northwestern Spain, contains very rich dinocysts comprising a total of 114 species and subspecies. Cyst abundance and species diversity show obvious decrease near the Cenomanian Turonian boundary. Other semiquantitative data related to the palaeoenvironments also show dramatic changes, indicating that fluctuations were obviously influenced by Oceanic Anoxic Events.更多还原