how to define the geologic time scale when you are given the fossils of certain organisms?

Today the geological time scale is divided into. major chucks. of time called Eons. Eons can be further divided into Eras, and each Era is divided into periods. We now live in the Phanerozoic Eon, the Cenozoic Era, and the Quaternary Period. Sometimes periods are further divided into Epochs, but they are usually called "early" and "late", for example. Late Jurassic or Early Cretaceous . Geological time is not divided into real number of years. instead they are divided into blocks of time when the fossil record shows when their were similar organisms on Earth.

The geological time scale was developed after scientist observed. changes in the fossils going from oldest to ypungest sediment - any Rocks. Scientists used relative dating to divide Earth's past into several blocks of time when similar organisms were on Earth. Later scientists used absolute dating to determine the actual number of years ago that events happened. The geological scale is divided into Eons, Eras, Periods, and Epochs.