It is characterized by the features of both lithostratigraphic unit bounded by objective unconformity and chronostratigraphic unit marked by strict property of time.
层序是层序地层学常用的且最重要的地层单位，它既是以客观不整合面为界面的岩石地层单位，又是有严格时间属性的年代地层单位，具岩石地层单位和年代地层单位的两重性，它具横向可预测、全盆地统一及时限短等特性。
global chronostratigraphic unit
国际性年代地层单位
informal chronostratigraphic unit
非正式年代地层单位
Lithostratigraphic pision and correlation of the Early Precambrian （Archean－Paleoproterozoic） in North China and age assignment of the lithostratigraphic units
华北早前寒武纪(太古宙-古元古代)岩石地层单位划分、对比及地质年代属性讨论
informal lithostratigraphic unit
非正式岩石地层单位
informal biostratigraphic unit
非正式生物地层单位
discontinuous lithostratigraphic unit
不连续岩石地层单位
unconformity bounded stratigraphic unit
不整合围限地层单位
standard global chronostratigraphic scale
标准世界年代地层表
A stratigraphic unit, especially a unit consisting of two or more formations deposited during a single geologic era.
地层学单位地层学中的一个单位，尤指包括在同一地质时期沉积的两个或两个以上地层的单位
FEATURES OF PLIOCENE STRATA AND LITHOSTRATIGRAPHIC UNITS ON HAINAN ISLAND
海南岛上新世地层特征及岩石地层单位
ESR Stratigraphically Chronological Study of the Gravel Layer in Yangluo Town,Wuhan City
武汉阳逻砾石层ESR地层年代学研究
On the Influence of 1920s Novels in the 1930s;
论20年代小说在30年代的“范本”地位
The primary unit of lithostratigraphy, consisting of a succession of strata useful for mapping or description.
地层，岩组岩石地层的基本单位，构成用于制图或描绘的一系列层次
in its place appears a new society, with its control centered in the state, the subordinate units of which are no longer kinship associations, but local associations;
组成为国家的新社会取而代之，而国家的基层单位已经不是血族团体，而是地区团体了。
Application of Analytic Hierarchy Process to Qualification Evaluation of Substitutive Company;
层次分析法在代建单位资质评价中的应用
THE AGES OF THE BAYAN OBO AND CHAERTAI GROUPS IN CENTRAL NEI MONGGOL DISCUSSED IN THE LIGHT OF ISOTOPE GEOCHRONOLOGY
从同位素地质年龄讨论内蒙古中部白云鄂博群及渣尔泰群地层的时代
Next year Party consolidation will be extended to include units and enterprises at the grass-roots level.
整党明年就要推进到基层，到各单位各企业，
On Modern Enterprise System Establishment in Geological Exploration Units;
论地勘单位建立现代企业制度的途径