There are two main categories for creationism, they are Young Earth Creationism and Old Earth Creationism. Young Earth Creationism is an idea that is based on the contents of the chapter Genesis from the bible and states that the earth was created about less than 10,000 years ago. Old Earth Creationism is a form of creationism that is based off of the contents of Genesis and does use scientific theories to support itself. Old Earth Creationism has two parts, the first being Progressive Creationism and the second being Day Age Creationism. In the theory of Progressive Creationism, it is though that what happened in Genesis happened not in a week as we know it, but slowly over the course of millions of years instead. Day Age Creationism is very similar to Progressive Creationism, in a way it adds onto Progressive Creationism. Day Age Creationism states that the creation of the universe and everything did take a week like the bible states, but each day in the week was not a normal 24 hour day but instead millions of years. Archeology is a branch of science which studies rocks, minerals and the formation of the earth. From Archeology it has been scientifically proven that the earth formed several billion years ago.
