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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.
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.
More sediment settles on the remains, and time and pressure turn the sediment surrounding the bones and teeth to stone.
Fossils are the remains of animals or plants that lived a long time ago.
When we think of fossils, the first things that come to mind are the bones of dinosaurs; but a fossil can be anything.
Trace fossils are not the remains of an animal, but something that shows how it lived or died.
Footprints, tools, or plant matter are different types of trace fossils.In the 1940s scientists developed a better tool for determining how old fossils were by using radioactive carbon isotopes.