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Bogs are another place where animal remains can be well preserved.A bog is a type of wetland where a large amount of dead plant matter accumulates.Types of Fossils There are two main types of fossils: body fossils and trace fossils.A body fossil is the physical remains of an animal. Some very small organisms, called microbacteria, leave behind microscopic particles called filaments.So long as the temperature remains below freezing, the animal stays frozen, sort of like a natural freezer.Paleontologists have found woolly mammoths perfectly preserved in permafrost.Though there is no one age, a good rule is anything over 10,000 years old can be considered a fossil.

If the fossil was once an animal, the animal has to die.Some organic material, like tree trunks, can be petrified.Petrification happens when the organic material is slowly replaced by minerals. Making a fossil is tricky and the conditions have to be just right.How Fossils are Dated: Superposition, Carbon-14, and Radiometric Dating Imagine you've found a fossil in your backyard and you want to know how old it is. A long time ago scientists used the concept of superposition, which states that the oldest layer of sedimentary rock is found at the bottom of the strata, or layers, and the youngest at the top.While they didn't have exact dates for how old these strata were, they could determine which fossils were older than others based on which layer they were found in.

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