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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。
Based on the abundant and latest field geologic data, the important problems in the division and comparison of lithostratigraphic sequences of the Late Jurassic Yixian Formation in Jinzhou and Yixian areas in western Liaoning are supplemented and corrected. Based on the multiple stratigraphic division of the International Stratigraphic Guideline, a complete set of lithostratigraphic units of the Yixian Formation has been established. According to the latest research results of biotic fossils such as primitive birds, insects, fish and reptiles, the formation period of Yixian Formation is limited to Late Late Jurassic.