What is the Geologic Column? And where can we find a complete picture? There are at least 25 places around the world, and the Grand Canyon is not one of them, but the Williston Basin as described in chapter 11 of The Doorway of Amethyst is.
But what column is this?
Imagine a great pillar of the Earth’s crust,
made by boring straight down from the topsoil
into the mantle. As you examine this pillar
from top to bottom, you see horizontal sections of different kinds of rock, some very fine, others coarse-grained or fossiliferous. Each section is a sample of the sediments of an era.
An introduction to geology (e.g., the first ten chapters above) will make easier reading of this unique chapter from the geology book. It is very important because you will then understand why geologists are fully persuaded that the earth has quite an age. |Link|