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For most fossils there are three basic things that are needed: sediment, pressure, and time.To create a mold and cast fossil, the animal has to die in a place where it will be covered with dirt, or sediment, fairly quickly, like an animal that dies in the ocean and sinks to the sea floor.Paleontologists have found woolly mammoths perfectly preserved in permafrost.Bogs are another place where animal remains can be well preserved.If the fossil was once an animal, the animal has to die.After that, depending on where the animal dies, the process of fossilization can occur in different ways.Imprint fossils are made when organic - or living - material is pressed into sediment, but does not decay like with a cast or mold, and the organic material leaves an impression in the formed rock.

Footprints, flowers, even droppings; all of these things can be turned into fossils under the right conditions.Animals that die in bogs and sink beneath the surface are protected from the elements, other animals, and bacteria that cause decay.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.A bog is a type of wetland where a large amount of dead plant matter accumulates.The soil in a bog is very low in nutrients and oxygen.

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