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Title: Biology Revision
Description: Revision about fossils (how they are formed etc)
Description: Revision about fossils (how they are formed etc)
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Biology Revision - Fossils
Fossil formation
1) An animal dies in a place where it can be buried by sand and mud (sediment)
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2) The skeleton of the animal is quickly covered by a layer of sediment before
completely decaying
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3) The weight of the sediment layers cause the particles to cement together,
encasing the skeleton in rock
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4) The fossil can only be discovered if the layer of sediment it is buried in is
raised upwards when the Earth’s crust moves
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Types of fossils
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Petrified shell - Shells of marine organisms, turned to rock
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Carbon film - Thin layer of carbon deposited onto rock by decaying organism
Footprint fossil - Trace fossil
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Dung fossil - Trace fossil
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Lump of ancient animal
faeces that has become rock
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Fossils can reveal a lot of information about the history of past life on Earth
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Title: Biology Revision
Description: Revision about fossils (how they are formed etc)
Description: Revision about fossils (how they are formed etc)