Graptolites appeared during late cambrian or one can say in cambrian around 500mya and they rose to dominance in and around ordovician and silurian. They got extinct in carbonifero...
sir...bt mene toh ab tk yahi padha hai... Devonian me extinct ho gye the graptolites
Sajan sarthak Best Answer
GRAPTOLITES WERE EXTINCT IN DEVONIAN .
THEY WERE LARGELY DOMINANT IN ORDOVICIAN TO SILLURIAN.
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WHERE AS TRILOBITES WERE OF PALEOZOIC AGE ..AND WENT EXTINCT IN PERMIAN.