G.T. Haywood wrote a small pamphlet entitled, "Before The Foundation of the World". In it, he describes each day of creation as being a 7,000 year period. If you read Genesis chapter 1, you will notice that on the 5th day, God said, "let the
waters bring forth." On the 6th day, God said, "let the
earth bring forth." Haywood says that the 5th day was a 7,000 year period of the dinosaur age.
The 6th day is the current period we are living in.
The 7th day is a period we have yet to enter. Lucifer's rebellion could have occurred at the end of the 5th day, destroying the dinosaurs. He was already a serpent by the beginning of the 6th day in the garden of Eden.