Fossils.

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The remains or evidence of a

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Presentation transcript:

Fossils

What is a Fossil? Traces or remains of living things from long ago. There are 2 main types of fossils: Original remains Rock fossils

Original Remains

Original Remains Fossils that are the actual bodies or body parts of organisms. There are 3 modes of preservation: Ice Amber Tar

Ice Ice is one of the best preservers of the remains of prehistoric life. Huge ice fields in Siberia and Alaska contain 10,000 year-old mammoths.

Amber Amber forms from resin, a sticky substance inside trees that flows like syrup and protects the tree by trapping insects.

Tar Original remains of animals have also been found in places where there are pools of tar – a thick, oily substance.

Rock Fossils

Rock Fossils If an organism is covered by or buried in sediment, it may become a fossil as the sediments become rock. There are 4 main types of fossils that we find in rocks: molds and casts, petrified wood, carbon films and trace fossils

Molds & Casts A mold is a visible shape that has left after an animal or plant was buried in sediment and then decayed away. A cast fossil is a solid model in the shape of the organism.

Petrified Wood The stone fossil of a tree is called petrified wood.

Carbon Films Carbon is an element that is found in every living thing. Sometimes when a dead plant or animal decays, its carbon is left behind as a visible layer.

Trace Fossils Trace fossils are not parts of an animal or impressions of it, but rather evidence of an animal’s presence in a given location. Trace fossils include: footprints, trails, animal holes, and even feces.

Fossil Formation

How Do Fossils Form? Conditions have to be just right for a fossil to form in rock – the organism must be preserved before it decomposes or disappears. Rock fossils form in sedimentary rock. Why not in igneous rocks?