Geologic Time is a crucial concept to understanding the history of the earth—including the evolution of life. Many different representations ... The geologic time scale is divided into eons, eras, ...

The geological time scale, established by scientists in the ... The scale functions as a massive calendar, dividing the history of life into eras, periods, and epochs based on fossil evidence.

Recognizable humans emerged at most 2 million years ago, a vanishingly small period on the geological scale. The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago ...

Primeval fish that were thought to be "living fossils," largely unchanged since the time of the dinosaurs, are actually evolving dramatically — and they evolved faster when Earth's continents ...

I like to use a meter stick and be very intentional with my spacing to model time as a scale. I also avoid using the far right ... of the Earth that is characteristic of a particular span of geologic ...