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I tell the students that they will now become archaeologists as they play with the Ph ET simulation "Radioactive Dating Game".I ask the students to divide themselves into partners, and request that one partner to get a computer, while the second partner gets the record sheet they will use.Reference fossils are remains of long-dead animals and plants that lived at a known time in history.If we know from radiometric dating that an animal only existed for a particular period of a few million years, we know that whenever we see that animal in a rock face, that part of the rock must have that particular age.By looking at how much of each element there is in a rock, we can trace it back and figure out how old those layers of rock are.

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By dating these surrounding layers, they can figure out the youngest and oldest that the fossil might be; this is known as "bracketing" the age of the sedimentary layer in which the fossils occur.

This also tells us that any other animals in the same rock, or the same layer, must have died around the same time.

One thing that makes index fossils more useful is the way sedimentary rock is created.

Everything in the universe is made of various elements, such as carbon, oxygen, iron and magnesium. Some of those elements are stable, and some are radioactive (unstable).

Radioactive elements are ones that, after a while, will spontaneously break down and turn into other, more stable elements.

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