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Types of Fossils Body Fossils These are real parts of an animal like bones or teeth. Leaf Imprints A plant leaf leaves a press mark in the mud that gets hard Shell Fossils The hard shell of a sea animal left its shape in a rock. Amber: Amber is yellow tree sap. Small bugs got stuck in it long ago. The sap turned hard like glass. Ice fossils: Ice can trap animals. Large hairy elephants called mammoths are found in cold ice. This keeps them safe.