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Scientists find out the age of a dinosaur fossil by dating not only the rocks in which it lies, but those below and above it.
Sometimes, scientists already know the age of the fossil because fossils of the same species have been found elsewhere and it has been possible to establish accurately from those when the dinosaur lived.
Before then, the Bible had provided the only estimate for the age of the world: about 6,000 years, with Genesis as the history book.
Hutton's theories were short on evidence at first, but by 1830 most scientists concurred that Noah's ark was more allegory than reality as they documented geological layering.
Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history.
After all, the ever-changing Earth rarely left a complete geological record.
The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly.Geologists call this the principle of lateral continuity.A fossil will always be younger than fossils in the beds beneath it and this is called the principle of superposition.In this instance, Uranium-238 is called the "parent" and Lead-206 is called the "daughter".By measuring how long it takes for an unstable element to decay into a stable element and by measuring how much daughter element has been produced by the parent element within a specimen of rock, scientists believe they are able to determine the age of the rock.