Meaning Of The Word Graptolite

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Graptolite Meaning

Graptolite Definition
Graptolite Definition

What's The Definition Of Graptolite?

graptolite in American English
noun: any colonial animal of the extinct class Graptolithina, most common in the Ordovician and Silurian Periods, thought to be related to the pterobranchs

graptolite in British English
noun: any extinct Palaeozoic colonial animal of the class Graptolithina, usually regarded as related to either the hemichordates or the coelenterates: a common fossil, used to determine the age of sedimentary rocks

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