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Methods for volcanic dating

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Eventually, as is the way of the world, gravity wins out and the tephra falls to the ground.

Some of it, the stuff we are interested in, falls on bogs!

The potassium-argon age of some meteorites is as old as 4,500,000,000 years, and volcanic rocks as young as 20,000 years old have been measured by this method.

Unlike people, you can’t really guess the age of a rock from looking at it.

With absolute age dating, you get a real age in actual years.

Pretty obvious that the dike came after the rocks it cuts through, right?

It is ejected during eruptions and since it is so small and light (a typical tephra shard is about 1/20th of a millimetre long, but can be smaller than that!

) it travels long distances, typically following prevailing winds.

Given its tiny size, tephra can often be rather hard to find deep down in our peat cores, so is often known as “crypto”, or hidden, tephra.

But we can treat samples of the peat in a lab in such a way (burning it in a furnace then rinsing with weak acid – please do not try this at home!