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Fossils are essential clues for dating rocks.

Very cool, tiny fossils called conodonts are essential in the petroleum exploration business; where light brown conodonts are found, conditions are right for oil and gas formation. Where they're black, the sediments have been cooked too long and won't produce oil or gas.

Fossils have much to tell us about what conditions were like when rocks were being formed, so they can actually give us a window on the deep, deep past.

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