我们的地球已有46亿年的历史。在其漫长的发展过程中,呈现出明显的阶段性。按地质时代长短,其地层单位依次划分为界、系、统、阶等。阶是最基本的年代地层单元。而这种划分不同地质时期的年代标准,就体现在这一个地质时期全世界发育最好的地点和研究得深入的标准上。常山县二都桥周塘村黄泥塘达瑞威尔阶层型剖面点就是其中之一,俗称“金钉子”剖面。 Our earth has a history of 4.6 billion years. In its long course of development, it has shown a clear phase. According to the length of the geological age, its stratigraphic units are divided into sectors, lines, systems, and ranks. The order is the most basic age unit. This kind of age standard that divides different geological periods is reflected in the world’s best-developed locations and in-depth research standards in this geological period. The Duerweier section profile point of Huang Nitang in Zhoudu Village, Erduqiao, Changshan County is one of them, commonly known as the “golden nail” section.