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Graptolites first appeared in the Cambrian Period, 545-490 million years ago (mya), and evolved rapidly during the following Ordovician Period (490-434 mya) when the greatest variety of different forms lived. They suffered a major decline in the Silurian (434-410 mya) and only a few forms lasted into the Devonian. They finally became extinct during the Carboniferous Period, about 315 my ago.
What else can I help you with?
Where did graptolites live?
They live in the Southern Pacific.
Index fossils include graptolites?
Graptolites are excellent index fossils because they have a short-lived existence in the geologic time scale and are widespread. They are useful for dating rocks and correlating layers in different locations, assisting in determining the age of rocks and reconstructing past environments.
What are graptolites?
Graptolites are extinct colonial marine organisms that lived from the Cambrian to the Carboniferous period, around 540 to 320 million years ago. They had a unique structure resembling tiny "tuning forks" and were important index fossils used for dating and correlating rock layers in geological studies.
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