index fossil in English
noun
1
a fossil that is useful for dating and correlating the strata in which it is found.
This ‘dating’ is based on the presence of the ammonite index fossil Dactylioceras tenuicostatum.
Use "index fossil" in a sentence
Below are sample sentences containing the word "index fossil" from the English Dictionary. We can refer to these sentence patterns for sentences in case of finding sample sentences with the word "index fossil", or refer to the context using the word "index fossil" in the English Dictionary.
1. It lived the generic Belemnite lifestyle, swimming around in large groups and catching fish with their hooked tentacles; as well as this, it often serves as an index fossil for the Jurassic, similar to Perisphinctes.