Unlike people, you can’t really guess the age of a rock from looking at it.Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.
Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.Now, same fossils are found in Europe, and therefore we should conclude that stratum are from Jurassic too. (For better understanding, imagine that I bury a box at a certain place.As we know that Earth is all the time disrupts by inner motions of its cores, what if those motions implied a fossil to move over stratum? If you come 2 years later, nothing proves that you'll be able to find it again, because 'things move in the inside') Your analogy with burying a box is not as accurate as you think.Three of these are known as Steno's principles, and a fourth observation, on crystals, is known as Steno's Law.The quotes given here are from the English translation of 1916.What the sediment contained is therefore once again put in the system and need to be either dissolved or re-sedimented in a new stratum.