mold fossils - a fossilized impression made in the substrate - a negative image of the organism cast fossils - formed when a mold is filled in FOUR TYPES OF FOSSILS

FOUR TYPES (CONTINUED) trace fossils - fossilized nests, burrows, footprints, etc. true form fossils - fossils of the actual animal or animal part.

What are fossils? Fossils are the remains of dead plants and animals. Fossils can help tell us about the past events of earth.

Fossils Most fossils are found in sedimentary rock. Once the original organisms died, they became trapped in sediments, which over time hardens into rocks. This is an example

What is preserved? The most likely materials to survive fossilisation are shells and objects constructed from resistant materials, such as Coral. Softer materials survive only when conditions are extremely favorable.

Fossil Developed The earliest fossils of complex life date from around 600 million years ago bacteria may have existed up to 3 billion years earlier. dinosaurs became extinct 65 million years ago!

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