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
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。
