Old Earth creationism
the idea that creation is consistent with scientific evidence
gap creationism
interpretation of Genesis that the 6 days of creation are literal, but with a time gap between Gen. 1:1 (“In the beginning God created the heaven and the earth.”) and Gen. 1:2–3 (“And the earth was without form […] God said, Let there be light […]”)
day-age creationism
interpretation of Genesis, holding that the 6 days in the Genesis account of creation are not ordinary 24-hour days, but are much longer periods