Effective range carbon dating

Carbon has unique properties that are essential for life on Earth.

Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.

It cannot be used to date volcanic rocks, for example.A stronger magnetic field deflects more cosmic rays away from the Earth.Overall, the energy of the Earth's magnetic field has been decreasing,[5] so more C is being produced now than in the past.Anything over about 50,000 years old, should theoretically have no detectable C.That is, they take up less than would be expected and so they test older than they really are.