Index fossil
01
지표 화석, 표준 화석
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
예시들
The presence of ammonite shells in a layer serves as an index fossil for the Jurassic period.
한 층에 암모나이트 껍질의 존재는 쥐라기 시대의 표준 화석 역할을 합니다.
