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In general, if lava was heated after the initial flow, it can yield an age that is too young.

In rubidium-strontium dating, micas exclude strontium when they form, but accept much rubidium.

Dinosaurs which are supposed have lived at least 60 million years ago, should not yield dates of thousands of years.

The same question could be asked in general of minerals that are thought to yield good dates.

Isochrons Isochrons are an attempt to avoid the need for an absence of daughter element initially in computing radiometric ages.

However, Henke admits that this can happen in some cases.

In Earth's upper atmosphere, on the edge of what is commonly called outer space, light atomic nuclei from unknown sources outside of our solar system traveling at speeds approaching the speed of light called cosmic rays rain down continuously.

In addition, tritium dating can be useful in determining the age of wines and brandies.

The carbon in the ethanol that came from plants will be relatively rich in 14C, since the plants it came from were relatively recently alive.