| NOUN | object | index fossil, guide fossil | a fossil known to have lived in a particular geologic age that can be used to date the rock / rock layer in which it is found |
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| Meaning | A fossil known to have lived in a particular geologic age that can be used to date the rock / rock layer in which it is found. | |
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| Synonym | guide fossil | |
| Broader | fossil | The remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil |
| Catalan | fòssil guia | |
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