Dating and correlating rock layers
Time factors of millions and billions of years is difficult even for adults to comprehend.However, "relative" dating or time can be an easy concept for students to learn.
“To test this idea, we matched earliest Cambrian records of carbon isotope variability from Siberia, Mongolia, and China with a Moroccan record constrained by five radiometric ages from interbedded volcanic ashes.We can do this by using the trilobite index fossil, because it appears in all three outcrops. There are two main methods determining a fossils age, relative dating and absolute dating.The weakness of evolutionary theory can be demonstrated by the tautologies and circular reasoning that is employed to provide “evidence” for large scale evolution.Even many evolutionists ruefully admit that this charge is undeniable with regard to the circularity invoked in dating rock layers.PALEONTOLOGY, AND in particular the study of dinosaurs, is an exciting topic to people of all ages.
Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.
These fossils are very useful for us because we can use them to date the layers of rock that they are found in.
Fossils that can be used in this way are called index fossils, and rock layers with the same index fossils in them can be correlated.
So the correct index fossil is: We can use index fossils and key beds to correlate, or match rock layers that are the same age.
By doing this we can then place other layers of rocks in order of their relative ages to find the oldest and youngest rocks in a series of outcrops.
But, how can we determine how old a rock formation is, if it hasn’t previously been dated?