Types of Fossils
Ever wondered why dinosaur bones feel so heavy? They've been petrified - literally turned to stone! When mineral-rich water soaks into bones and leaves minerals behind, it preserves the detailed internal structure of the original organism.
Fossils come in many fascinating forms. Molds and casts form when shells get buried and dissolved, leaving hollow spaces that sometimes fill with minerals. Compression fossils occur when pressure squeezes out liquids from buried organisms, leaving thin carbon films - perfect for preserving ancient plants and insects.
Impression fossils show fine details of an organism's external structure in mud or silt, while unaltered remains preserve organisms with little change in ice, tar pits, or amber. Don't forget trace fossils like footprints, burrows, and even fossilized poop (coprolites) that provide indirect evidence of prehistoric life!
Fun Fact: Amber fossils are actually hardened tree sap that trapped insects and small organisms millions of years ago, preserving them almost perfectly!
