CC BY-SA 3.0], via Wikimedia Commons' src=" alt="The canyon is shown with many layers" width="3600" height="2400" srcset=" sizes="(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px"/The Geologic Time Scale and the basic outline of Earth history were worked out long before we had any scientific means of assigning numerical units of age like years to events of Earth history.

Working out Earth history depended on realizing some key principles of relative time.

Ice core sampling normally uses the assumption that the ring bands observed represents years.

relative dating of geological events-19relative dating of geological events-38relative dating of geological events-64

The same thing can be done with geologic features in a rock outcrop.

To do this geologists use the Laws of Relative Dating.

We do this all the time in our regular day to day lives.

For example, lets put the following movies in order of relative age from oldest to youngest: Twilight, Finding Nemo, the Avengers, the Hunger Games.

This theory held that the past was the key to the future and that processes that formed the layers were the very slow processes that we see forming layers at the bottom of the ocean today. Until Lyell successfully convinced scientists that uniformitarianism was the correct theory, it was believed that the worldwide flood and other catastrophic events were primarily responsible for the formation of the geologic layers and that they didn’t represent long ages.

Later, when radiometric absolute dating methods were developed, they still were not applicable to sedimentary layers.Consequently, today the dates assigned to the “standard geologic column” are still based upon Lyell’s assignment where index fossils are used to date the rocks and the rocks are used to date the fossils. Today, it is not surprising that many geologists are rejecting uniformitarianism and embracing catastrophism again.There is much evidence that refutes uniformitarianism. Helens demonstrated that rapid deposition and rapid canyon erosion are a fact. Also, when life forms die they only become fossils when they are buried rapidly. Polystrate tree fossils that extend through multiple layers are common. Consequently, the uniformitarianism model, along with the age assignments of the geologic column, is in doubt. God, the Father, sent His only Son to satisfy that judgment for those who believe in Him.Climate chronology uses evidence of a climatic change, such as an ice age, as a benchmark for dating.states, “Before the 20th century, archaeologists and geologists were largely limited to the use of relative dating techniques.Lines correlating the strata with equivalent fossil content." width="228" height="167" srcset=" sizes="(max-width: 228px) 85vw, 228px"/The fossils found at any time are unique, and the fossils in layers of different ages have progressed and changed as time has moved forward.