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Clues from Fossils Fossils give us information about living things in the past. Slide 2 What Can you learn from fossils? Scientists use clues from fossils to learn about the past. Slide 3 How Fossils Form When a plant or animal dies, the soft parts quickly decay. Hard parts are left behind. teeth bones shells Slide 4 Sedimentary Rocks Most fossils are found in sedimentary rocks. The remains are quickly buried by the sediments. Slide 5 Imprints Sometimes a shallow print or impression is the only evidence that a animal or plant ever existed. Slide 6 Slide 7 Slide 8 Molds Shells often leave behind fossils known as molds. It is a hollow form with a particular shape. Slide 9 Molds A mold forms when water seeps into the rocks where a shell is buried. The water dissolves the shell, which leaves a hollow space where the shell once was. Slide 10 Slide 11 Slide 12 Coral Fossil Slide 13 Slide 14 Slide 15 Dinosaur Tracks Slide 16 Slide 17 Cast A cast is formed or shaped in a mold when minerals slowly accumulate in a mold. They take the shape of the original shell and form a copy. Slide 18 Slide 19 Slide 20 Cast Slide 21 Slide 22 Trilobite Slide 23 Ancient Fish Slide 24 Sharks Tooth Slide 25 Slide 26 Slide 27 Glen Rose, Texas Slide 28 Slide 29 Slide 30 Slide 31 Slide 32 Slide 33 Slide 34 Other Ways Fossils Form Amber Sometimes entire insects became trapped in sticky sap oozing from certain trees.