index fossil meaning in Hindi

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It has a cosmopolitan distribution and is an important index fossil in biostratigraphy.
It is an important index fossil in biostratigraphy.
Important index fossils for the Cenomanian are the ammonites " Mantelliceras mantelli ".
Many ecphora species are important index fossils.
The family includes several important index fossils.
They have been recorded from every continent and many are used as zonal or index fossils.
It has become especially useful to metamorphic and igneous geologists where index fossils are seldom available.
Other index fossils from Coon Creek date a little older than 70.6 million years.
They lived during the Jurassic Period and serve as an index fossil for that time period.
"Phyllograptus " species are excellent index fossils or guide fossils for identifying Ordovician rocks.

noun.

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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