| index fossil | ซากดึกดำบรรพ์ดรรชนี [ธรณีวิทยา๑๔ ม.ค. ๒๕๔๖] |
| index fossil | (n) a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found, Syn. guide fossil |
| 示準化石 | [じじゅんかせき, jijunkaseki] (n) index fossil (fossil which suggests a date of the formation of a rock stratum); key fossil; leading fossil [Add to Longdo] |