Fossils are the remains of once-living things. They can be plant or animal bodies that have been partially or completely replaced by minerals. They can be impressions that just show the shape of a creature, or tracks left behind by a traveler, or other remnants that testify to the lives of long-gone organisms. Some rare fossils even have original organic soft tissue encased in rock, showing that their organisms couldn't have been dead for millions of years, as evolution claims.
All fossilized creatures appear suddenly and fully formed in the rock record, with no clear history of evolutionary transitions. This is consistent with the Bible’s assertion that God created life forms to reproduce within their own kinds. Second, fossils formed very quickly, before the animal or plant completely decayed or was scavenged. This means that fossils formed through catastrophic circumstances. Most fossils can be attributed to the worldwide catastrophe of Noah’s Flood, in which countless creatures were killed and then rapidly buried, or to its residual effects.
Fossils also serve as reminders of God’s character. His righteousness and holiness obligated Him to cleanse the world of wickedness by drowning every land-dwelling, air-breathing creature that was not providentially preserved on the Ark. Fossils should be taken as reminders of the penalty of man’s sin and should motivate people to prepare for death.