- aluminum foil
- modeling clay
- Plaster of Paris
- whatever you want to fossilize--plants, shells, plastic bugs (but don't worry, all you'll do is push these into the clay and take them back out. They won't really be fossilized!)
1. Put a lump of modeling clay on a piece of aluminum foil and flatten it until it's about 3/4" thick.
4. Play other fun games while you wait for the plaster to dry! Ours were ready in about an hour.