Index fossil
01
标准化石, 指标化石
a fossilized organism that is useful for dating and correlating the strata in which it is found, typically indicative of a particular time period in Earth's geological history
例子
The trilobite is an index fossil commonly used to date Paleozoic rock layers.
三叶虫是一种标准化石，常用于测定古生代岩层的年代。
Geologists rely on index fossils to determine the relative age of sedimentary rock formations.
地质学家依靠指标化石来确定沉积岩层的相对年龄。
