index fossil
guide fossil

Other index fossils from Coon Creek date a little older than 70.6 million years.

It is an important index fossil in biostratigraphy.

Agnostotes orientalis is used in biostratigraphy as an index fossil.

It has a cosmopolitan distribution and is an important index fossil in biostratigraphy.

Lejopyge laevigata is used in biostratigraphy as an index fossil.

Glyptagnostus reticulatus is used in biostratigraphy as an index fossil.

It is used in biostratigraphy as an index fossil.

They are used as an index fossil in the Ordovician.

However, misleading results are produced if the index fossils turn out to have longer fossil ranges than first thought.

Tetragraptus approximatus is used in biostratigraphy as an index fossil.