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What is the plural of index fossil?

What's the plural form of index fossil? Here's the word you're looking for.

Answer

The plural form of index fossil is index fossils.

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Examples
Their distinctive scales are used as index fossils for the relative dating of rock layers.
They are very abundant in some Paleozoic formations and include useful index fossils.
Carboniferous and Permian strata often contain useful index fossils belonging to this group.
These rocks are interbedded in Emsian marine sedimentary successions that are well documented by index fossils.
Unfortunately, geochronologists assume that index fossils represent an absolute pattern.
Thus, the Silurian-Devonian boundary is anchored to the first occurrence of specific index fossils.

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