GEOLOGY

Detailed explanation-1: -Some strata contain index fossils, or fossils associated with a specific time in Earth’s history. If the same index fossil is found in different strata far apart, the layers likely formed around the same time. By studying strata, geologists have determined the relative order of major events in Earth’s history.

Detailed explanation-2: -RELATIVE AGE OF ROCKS If two rock layers have the same index fossils, then they’re probably about the same age. Using Index Fossils to Match Rock Layers. Rock layers with the same index fossils must have formed at about the same time.

Detailed explanation-3: -The principle of fossil correlation states that the strata containing a group of fossils that are all the same age must be of similar age to the fossils. Strata are layers of rock, and each single layer is known as a stratum.

Detailed explanation-4: -Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation. Index fossils are fossils that are known to only occur within a very specific age range.

Detailed explanation-5: -The three concepts are summarized in the general principle called the Law of Fossil Succession: The kinds of animals and plants found as fossils change through time. When we find the same kinds of fossils in rocks from different places, we know that the rocks are the same age.