Paleontologists use animals to establish the geological ages of specific rock layers, but this is an ineffective method. When fossils are used to date rocks, they are known as index fossils, which have been chosen to represent that layer of rock. Based on superposition, the lower strata is older and creatures in a lower strata evolved first and creatures that evolved later are in the higher up strata. Scientists simply guess how long it took for one creature to evolve into another and date them
Paleontologists use animals to establish the geological ages of specific rock layers, but this is an ineffective method. When fossils are used to date rocks, they are known as index fossils, which have been chosen to represent that layer of rock. Based on superposition, the lower strata is older and creatures in a lower strata evolved first and creatures that evolved later are in the higher up strata. Scientists simply guess how long it took for one creature to evolve into another and date them