中文摘要：

二叠纪末生物大灭绝及随后早三叠世复苏期是古、中生代之交重大地质突变期的主体。这一时期，生物演化更替显著、生态空间扩展快速广泛，因而生物地层分辨率高、可对比性强；各种重大地质事件活动频度和作用强度显著增加、影响范围广泛，因而其产生的识别标志明显、区域精时对比能力强；由于突变期伴随有强烈的地内构造活动，火山物质提供了丰富的精确地质测年素材，同时伴随重大突变过程而被强化的历史阶段性和时间节奏性地质记录，也为年代地层精确定年和计时提供了独特的条件。因此古、中生代之交的地质记录为高分辨率生物一环境一年代地层综合研究提供了最佳条件。文中以中国南方二叠系一三叠系界线地层和下三叠统研究工作为基础，系统总结和分析了这一时期的生物地层序列、环境事件标志及其地层学价值、年代地层学研究进展，提出环境地层学研究是进一步深化古、中生代之交重大地质突变期地层学研究的新突破口。

英文摘要：

The end-Permian mass extinction and its subsequent Early Triassic recovery comprised the main part of the great Paleozoic-Mesozoic transition. During the time, the biotic evolutionary succession markedly speeded up and the ecological space rapidly expanded, and thus the biostratigraphy is of high resolution and wide correlation. Meanwhile, the various geological events became more frequent, more powerful, and more widely influenced, and thus the events are more recognizable and beneficial for the time-precise stratigraphic correlation. The great transition generally comes with strong tectonic activity such as volcanic eruption, which provides the unique materials for the precise age-dating. Together with the enhanced periodicity of geological process, the chronostratigraphy can be more precisely defined. Consequently, the geological records through the great Paleozoic Mesozoic transition provide a unique condition for the comprehensive study of high- resolution biological-environmental-chronologic stratigraphy. Based upon the studies of the Permian-Triassic boundary and Lower Triassic in South China, the recent advances in biostratigraphy and chronostratigraphy, and the indications of environmental events and their application in stratigraphy are summarized and discussed. The environmental stratigraphy is suggested as a new impetus for deepening stratigraphic research through the Paleozoic-Mesozoic transitional time.