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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.
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Where did graptolites live?
They live in the Southern Pacific.
Index fossils include graptolites?
Ordovician Period
What are graptolites?
Graptolites were hemichordates that appear in the fossil record resembling a series of sawblade teeth. They are good index fossils for the Ordivician and Silurian geologic time periods.
What time period did iguanodon live in?
Cretaceous period,
What time period did ankylosaurs live?
Cretaceous period
What time period did the Bachipods live in?
Ordovician Period
What time period did madame cj walker live in?
what time and period did madame cj walker live
What musical time period did leanoard bernstein live in?
Modern time period or 20th century period
What has the author David K Loydell written?
David K. Loydell has written: 'Graptolites from the Upper Ordovician and Lower Silurian of Jordan' -- subject(s): Paleontology, Graptolites
What time period did the allasorous live in?
It lived in the Jurassic period.
What geologic time period did the crylophsaurus live?
the Jurassic Period
What time period did James Madison live in?
He lived in the time period of 1751 to 1836
