index fossil


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Synonyms for index fossil

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

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References in periodicals archive ?
I even found a tiny index fossil the paleontologists said was really important."
However, the position of the SDB within the section remains contentious because of the absence of the index fossils found in the Klonk Section, the Global Stratotype Section and Point (GSSP) (Zhao & Zhu 2014).
Ammonites are excellent index fossils, meaning it is often possible to link the rock layer in which a particular species is found to specific geological time periods.
The fossil bones belong to ancestors of our modern baleen whales and their age was determined using so-called co-occurring index fossils.
However, all of these sea snakes have previously been reported only from the Eacene of North America (Holman, 2000) and are considered to be "index fossils" for the Early and/or Middle Eocene.