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Let's pretend for the sake of simplicity that all the fossils we've found are really well-studied and our dating of them is as accurate as it possibly can be.Now, we know that layer D cannot be any older than 4.5 mya because the fossil found there didn't exist earlier in time. In layer B, the fossil closest to the top doesn't tell us a whole lot on its own.These energy charged electrons progressively accumulate over time.When a sample is heated to high temperatures in a laboratory, the trapped electrons are released and return to their normal positions in their atoms.decay or the rate of other cumulative changes in atoms resulting from radioactivity. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number..One half-life is the amount of time required for of the original atoms in a sample to decay.However, paleoanthropologists rarely use it to date sites more than several million years old.rock, soil, and clay produce constant low amounts of background ionizing radiation.

In this way, the confidence level of the dating is significantly increased.

It is also based on the fact that background radiation causes electrons to dislodge from their normal positions in atoms and become trapped in the crystalline lattice of the material.

When odd numbers of electrons are separated, there is a measurable change in the magnetic field (or spin) of the atoms.

Let's say we have a bunch of rock layers and we can't date them (see image below).

Because of the Law of Supposition, we know layer A is younger than layer B and we know B is younger than C, but we don't know if layer B was deposited 1.5 million years ago (mya) or 3.2 mya. Now let's say we identify fossils in some of these layers and we know roughly when the living organisms that made these fossils existed in the past.

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