This aspect of Werner's model was useful for explaining the origin of tilted sedimentary rocks.
(dark brown) Flat lying sedimentary rocks were eventually precipitated.
By modern scientific calculations, the earth is many millions of years old.
This idea is known as Plutonism, in reference to the God of the deep underworld.
Hutton viewed tilted strata as having been initially deposited horizontally, and then were subsequently deformed (tilted and folded) by the forces of Earth's internal heat engine.
That is because the PG knows that certain conditions existed on earth during each of the geologic time periods.
Knowing that a certain rock was deposited in the “Pennsylvanian”, for example, may help the PG to interpret rocks in a certain area.