There is much evidence from the subject of geology that supports the young earth creation model. The global flood described in the Biblical scripture (Genesis 7) deposited large amounts of sediment in the form of layers based on the type of sediment. These layers of sediment have hardened into rock and contain many fossils, most of which are of marine origin. The Flood also produced many erosional landforms around the earth. Many animal species and kinds became extinct as a result of the flood. Many remnant lakes are found around the world as a result of the Flood of Genesis. After the Flood, creationists believe a major ice age was initiated as a result of the flood and evidence supports one single ice age in contrast to the multiple ice ages that evolutionists propose. Creationists and creation geologists also dispute the ages that evolutionists assign to rocks and fossils and that these dating methods are in error.