It showed the order in which life on Earth changed.
It means that we can use present-day processes to interpret the past. The laws of nature say that sea animals must live in the sea.
That law has never changed, so the rock must have formed near the sea.
The rock may be millions of years old, but the fossils in it are a clue for us today about how it formed. Therefore, the fossil means that the rock definitely formed by the sea.
Now imagine that you find that same rock with fossils of a sea animal in a place that is very dry and nowhere near the sea. This tells you that even though the area is now dry, it must have once been underwater.
You will learn about some of the scientific principles that historical geologists use to describe Earth's past.
You will also learn some of the clues that scientists use to learn about the past and shows you what the geologic time scale looks like. The first principle you need to understand about geologic time is that the laws of nature are always the same.Clues like this have helped scientists learn that Earth's surface features have changed many times.Spots that were once covered by warm seas may now be cool and dry.However, the early geologic time scale only showed the order of events.It did not show the actual years that events happened.In the process of relative dating, scientists do not determine the exact age of a fossil but do learn which ones are older or younger than others.