How Fossils Form main content.

How Fossils Form

How Do We Know Where to Look for Dinosaur Fossils?
Dinosaur fossils are found almost exclusively in sedimentary rocks, which form when sand, silt, mud, and organic material settle out of water or air to form layers that are then compacted into rock.


What's the Big Idea About Paleontology?

Learn about fossils, extremely rare—and valuable—records of the past. 

Paleontology is packed with mysteries about living things such as plants and animals that lived thousands, millions, and billions of years before the first modern humans. To solve these mysteries, paleontologists use fossils.


Identification Adventure

Reconstruct and identify a fossil skeleton.


Layers of Time

How do your fossil-sorting skills stack up? Put them to the test with this kid-friendly online puzzle.


Return to Milstein Science Series: Prehistoric Ocean Dwellers