Preservation fossils: can occur when an animal is trapped in tar, skin and hair often remain intact, can occur in freezing conditions, insects inside amber, Permineralization/petrification fossils: minerals are left behind when living thing dissolves and new minerals form, organic matter completely replaced, an example is petrified wood in a tree, fossil strongly resembles original living thing but is heavier, Cast and Mold fossils: form after living thing dissolves, an impression of a once-living organism, 3-D example of something alive in past, common with shells and prehistoric arthropods, carbonization fossils: carbon left behind during decomposition, common with reptiles and marine animals, detailed "carbon" copy of plant or fish, formed from pressure after being buried in sediment in bodies of water,

Types of fossilization

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