fossil, the remains of an ancient organism that are preserved in rock, sedimentary, the type of rock that fossils are mostly preserved in, bottom layers, where the the oldest fossils are often found, top layers, where the youngest fossils are often found, body fossils, the type of fossil that are the preserved remains of an organism's body (ex: bones, teeth), trace fossils, the preserved signs of an organism's activity (ex: footprints, poop, burrows, nests), index fossils, a special group of fossils that scientists use to quickly date rock layers, short-lived , the most important feature of a good index fossils.

Fossils

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