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用以划分地球历史的单位称为地质时代单位。地质时代单位由代、纪、世、期四个级别和一个自由使用的时间单位“时”组成。其中代、纪、世是国际性的时间单位,期是大区域性的时间单位,时是地方性的时间单位。划分地层的单位称为地层单位。地层单位除界、系、统、阶外,还有群、组、段、带、杂岩五个单位。其中界、系、统、带主要是根据生物的发展演化阶段来划分的,适用范围较大,是国际性的或全国性和大区域性的单位,通常又称为时间地层单位。而群、组、段三个单位则主要是根据地层岩性和地层接触关系来划分的,适用范围较小,是地方性的地层单位,通常又称岩石地层单位。目前,在地质报告和文献中,关于地质时代单位的叫法,存在着某些不够明确甚至混乱的情况。
The unit used to divide the history of the earth is called the Geo-temporal unit. Geological epoch unit by the generation, discipline, world, period of four levels and a freely used unit of time “.” The generation, the discipline and the world are international units of time. They are large-scale units of time and local units of time. The unit that divides the formation is called a stratum. Stratigraphic units in addition to the system, system, order, as well as group, group, section, belt, complex five units. The boundaries, systems, systems and belts are mainly divided according to the stages of the development and evolution of living things. They are applicable to a large area and are international, national and regional units commonly known as temporal stratigraphic units. The group, group, section of the three units are mainly based on stratigraphic lithology and stratigraphic contact relationship to be divided, the scope of application is small, is a local strata unit, also known as rock strata units. At present, in the geological reports and the literature, there are some situations that are not clear enough or even confused about the name of geologic time units.