You need a small fossil for this craft. If you have a suitable beach nearby you may be able to find an ammonite fossil. If not, they can usually be purchased for between 50p and £1.50. We bought ours from Borders book shop. After explaining what a fossil is, divide the Rainbows into small groups and give each group a fossil and each child a small piece of clay. The Rainbows need to roll the clay into a ball and then press the fossil into the clay to leave an imprint. To turn this into a necklace make a hole through the top of the clay using a pencil. When the clay is dry you can thread a piece of wool through the hole.

Cut 'dinosaur bones' from white paper and place them at one end of the hall. Split the Rainbows into teams. The girls take it in turns to run up and collect a bone. When they have all the bones they want each team 'builds' a dinosaur.

Print dinosaurs onto card (I used mircosoft clipart). Hide the dinosaurs around the room. As the Rainbows arrive see how many different dinosaurs they can find. Alternatively give each child a card with one dinosaur on and see how many of that type they can find.

Split the Rainbows into small groups and give each group a tray with sand, flour or compost in. Hidden in the tray should be something for them to find. We used little plastic dinosaurs (purchased from a local bits and bobs shop at £1.99 for 15) and old chicken bones that had been repeatedly boiled. Each Rainbow was given a large paintbrush to uncover their finds.