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Trace fossils are the marks left by a living organism, such as feces, footprints or impressions of feathers or leaves.

Organisms usually need to be covered by mud, sand, tar or some other sediment as soon as possible or frozen or dessicated (dried out) for fossilization to occur.

Fossils, by definition, are the remains or traces of organisms that lived at least 10,000 years ago.

This date marks the end of the Cenozoic Era and the Pleistocene Period on the geologic time scale.

A sticky goo that surrounds the bacteria allows precipitation of minerals and entrapment of sediments, making a bulbous structure.

Scientists are still finding a few new sites where they live today but they were quite abundant on earth some 2 billion years ago, and perhaps earlier.

Footprints, tools, or plant matter are different types of trace fossils.

The two fossil categories can be broken down further.

Fossils are found all over the world and on every continent.

A body fossil is the physical remains of an animal. Some very small organisms, called microbacteria, leave behind microscopic particles called filaments.

Trace fossils are not the remains of an animal, but something that shows how it lived or died.

Geologists credit stromatolite activity for creating the earth's first atmospheric oxygen and making animal life possible.

Fossils are the remains of animals or plants that lived a long time ago.

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