Here are the ways how the geological timescale was invented and how it is divided:
- The geological timescale was formed by studying the rock structure and their layers and examining the index fossils. They arranged the different rocks according to their age based on the texture and other details to form the geological scale. In today's time the age of rocks and fossil is determined by the radioactive carbon dating to know about the geological time era.
- The geological scale is organized with the oldest time period at the bottom with the new eras at the top.
- There were various incidents that changed the earth's environment during the Precambrian time like division of the land into continents, bombardment of large objects into the atmosphere, transition to oxidizing atmosphere etc.
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