Start Relative dating principle of original horizontality

Relative dating principle of original horizontality

A more modern way of stating the same principle is that the laws of nature (as outlined by the laws of chemistry and physics) have operated in the same way since the beginning of time, and thus if we understand the physical and chemical principles by which nature operates, we can assume that nature operated the same way in the past.

Note that you can follow the layers all along the walls of the canyon, and you can find the same layers on both sides of the canyon.

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).

The Grand Canyon is particularly good for this because different sedimentary rocks have different colors.