The Definition of ERA and Its Significance in Geological Time Scale

What was the ERA?

Answer:

An Era is usually defined as a major subdivision of geological Eon. It represents a period of long time, in terms of millions of years. There are 3 Eras of the Phanerozoic eon, according to the geological time scale, they are the Paleozoic, the Mesozoic and the Cenozoic. All these 3 Eras are comprised of many sequential arrangement of major and minor events soon after the formation of earth.

This sequential arrangement of events shows the progressive evolution from the unicellular organisms to the multi-cellular and more complex organisms. These eras are comprised of various fossils and fossil assemblages, which are explored in the recent times. The study of these fossils helped in the understanding and evolutionary pattern of how life evolved on earth.

What is the significance of ERA in the geological time scale?

Answer:

An Era is a significant unit in the geological time scale as it represents a large span of time and captures important evolutionary events that shaped life on Earth. Each Era is characterized by distinct geological events, climatic changes, and the emergence of new species.

Studying the different Eras provides valuable insights into the evolution of life forms, the impact of environmental factors, and the development of Earth's geology over millions of years. By analyzing the fossil record and geological layers associated with each Era, scientists can reconstruct the history of life on Earth and understand how organisms have adapted to changing environments.