人们普遍认为地质学领域中几乎很少有不涉及时间概念的问题。地质学的统一原则是地质事件所发生的时间顺序和对比。为了解决全球性地质问题,要求地层学和古生物学在解决世界地层对比方面发挥更大的潜力。用生物地层学、同位素年龄测定、古地磁这“三位一体”的方法,建立国际统一的时间标尺(Time-Scale),是当前地质界的重要任务之一。正确的对比首先要求正确的划分各系、统年代地 It is generally accepted that there are few problems in the field of geology that do not involve the notion of time. The unifying principle of geology is the chronological order and comparison of geological events. In order to solve the global geological problems, stratigraphy and paleontology are required to exert more potential in solving stratigraphic comparisons in the world. It is one of the important tasks of the present geological community to establish an internationally-unified time-scale by means of biostratigraphy, isotopic age determination and paleomagnetic as a “trinity” method. The correct contrast first requires the correct division of the various departments, all generations