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穿时(diachronion),这个术语是现代地层学中表示持续地海侵或海退情况下其地质时代随地改变的岩石地层单位,其界限斜穿地质时间面或生物地层带的现代地层学术语。穿时的同义语是时侵(time-transgressive)。早石炭世含煤地层就是一个具有穿时特征的岩石地层单位,分布于欧洲、我国华南、西北及昆仑秦岭区,属早石炭世中期、晚期海侵或海退的沉积序列。在我国具有代表性的当推测水组。我国南方各地与测水组相当的地层分布于
Diachronion, a term used in modern stratigraphy to refer to modern stratigraphic units that obliquely penetrate geologic time zones or biostratigraphic zones, is a unit of lithostratigraphy that shows the evolution of geology over time in cases of continued sea transgression or regression. Synonyms when worn are time-transgressive. The coal-bearing strata in Early Carboniferous is a unit of lithostratigraphic unit with perforation characteristics. It is distributed in Europe, South China, Northwest China and the Qinling Mountains in the Kunlun Mountains. It is a sedimentary sequence of mid-late Early Carboniferous and transgression or regression. In our country as a representative when speculation water group. Equivalent stratigraphy to the water-logging group is found in all parts of southern China