Gap creationism is a form of old Earth creationism which posits the belief that the six-yom creation period, as described in the Book of Genesis, involved six literal 24-hour days, but that there was a gap of time between two distinct creations in the first and second verses of Genesis, which the theory states explains many scientific observations, including the age of the Earth.[3][4][5] This view was popularized in 1909 by the Scofield Reference Bible.