Progressive creationism is the religious belief that God created new forms of life gradually, over a period of hundreds of millions of years. As a form of Old Earth creationism, it accepts mainstream geological and cosmological estimates for the age of the Earth, but posits that the new "kinds" of plants and animals that have appeared successively over the planet's history represent instances of God directly intervening to create those new types by means outside the realm of science. Progressive creationists generally reject macroevolution because they believe it to be biologically untenable and not supported by the fossil record, and they generally reject the concept of universal descent from a last universal ancestor.