Trilobites originated during the Cambrian era, flourished through the Paleozoic era, declined during the Devonian era, and finally became extinct in the Permean mass extinction event.
In total there were live trilobites on the earth for about 290 million years.
Cambrian Period
Cambrian Period............by R.E
yeah
Trilobites were associated with the Paleozoic era, from the Cambrian to the Permian.
The trilobite is a famous Palaeozoic marine creature that lived around 540 to 250 million years ago. These arthropods were among the most successful and diverse animal groups of their time, with numerous species ranging in size, shape, and habitat. Trilobites left behind an extensive fossil record that provides valuable insights into Earth's ancient marine ecosystems.
Trilobite
they were index fossils because they were found everywhere, had distinct characteristics, and lived for a short period of time.
because they changed slowly through time(:
Trilobite.
Trilobites are one of the index fossils commonly found in Cambrian rock layers. These ancient arthropods lived in the seas during the Cambrian period and are used by geologists as markers for dating rocks from that time period.
Trilobite+sand=crab
rock and plankton