Clearly, such huge time periods cannot be fitted into the Bible without compromising what the Bible says about the goodness of God and the origin of sin, death and suffering—the reason Jesus came into the world (See Six Days? He said, This only makes sense with a time-line beginning with the creation week thousands of years ago.
It makes no sense at all if man appeared at the end of billions of years.
These exceptional lengths of time seem unbelievable, but they are exactly the spans of times that scientists use to describe the Earth. When did the giant Rocky Mountains form and when did dinosaurs walk the Earth?
To answer these questions, you have to think about times that were millions or billions of years ago.
People wonder how millions of years could be squeezed into the biblical account of history. Christians, by definition, take the statements of Jesus Christ seriously.Scientists have put together the geologic time scale to describe the order and duration of major events on Earth for the last billion years.Some examples of events listed on the geologic time scale include the first appearance of plant life on Earth, the first appearance of animals on Earth, the formation of Earth's mountains, and the extinction of the dinosaurs.So, we have a “clock” which starts ticking the moment something dies.Obviously, this works only for things which were once living.