I prefer Gap Restoration which is a literal interpretation and is the only interpretation that explains why day 2 was not called a good day and why there was killing in pre-Adamic men and pre-Endemic species.

If you would like to learn about it more, read here,

http://www3.telus.net/trbrooks/mystery.htm

Because of the sin of the inhabitants of earth's earliest ages, God laid waste and desolate in Genesis 1.2. But praise God He restored creation summed up the six literal days. Amen.

p.s. and you didn't even need a biology degree or a masters in theology to realize that.