辽宁西部上侏罗统义县组研究新认识

A FURTHER CONTRIBUTION TO THE KNOWLEDGE OF THE UPPER JURASSIC YIXIAN FORMATION IN WESTERN LIAQNING

根据丰富的、最新的野外地质资料,对辽宁西部锦州和义县地区晚侏罗世义县组的岩石地层划分和对比中的重要问题进行了补充和修正。以《国际地层指南》的多重地层划分观点为基础,建立了一套完整的义县组岩石地层单位。根据最新的原始鸟类以及昆虫、鱼、爬行类等生物化石研究结果,认为义县组的形成时期限于晚侏罗世晚期。

On the basis of the latest available abundant information from field geological work, some important ideas about the lithostratigraphic classification and correlation of the Late Jurassic Yixi-an Formation in Jinzhou City and Yixian County, western Liaoning, have been supplemented and revised. According to the multiple stratigraphic division of the International Stratigraphic Guide, a complete column of lithostratigraphic units of the Yixian Formation has been erected. Based on the evidence of primitive fossil birds, together with the data afforded by other fossil groups (insects, fishes, reptiles, conchostracans etc. ), the age of the Yixian Formation is assigned to late Late Jurassic (about Tithonian).