5 relative dating principles

Geologist are often trying to learn more about Earth and its history.

It is widely accepted that the Earth is about 4.5 billion years old. For example, the Colorado river has eroded away parts of the Columbia plateau.

Steno formalized the laws of superposition, original horizontality, original continuity and inclusions in his publication entitled states that any inclusion is older than the rock that contains it.

Steno's idea that fossils are older than the rock in which they are found hints at this principle, but Hutton is most often given credit for this principle.states that fossil organisms succeed one another in a definite, irreversible, and determinable order.

Precambrian rocks must therefore be correlated by means of precise isotopic dating.

From the beginning of this course, we have stated that the Earth is about 4.6 billion years old.

How do we know this and how do we know the ages of other events in Earth history?

The goal of this lecture is come to come to a scientific understanding of geologic time and the age of the Earth.

In order to do so we will have to understand the following: To better understand these concepts, let's look at an archeological example: Imagine we are a group of archeologists studying two different trash pits recently discovered on the Tulane University campus and at the Audubon Zoo (where they all aksed for you).


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