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And let's say you feel pretty good that this soil hasn't been dug up and mixed or anything like that.
It looks like it's been pretty untouched when you look at these soil samples right over here. Then, even though carbon-14 dating is kind of useless, really, when you get beyond 50,000 years, you see these fossils in between these two periods.
We know that an element is defined by the number of protons it has. And when we talk about a given element, but we have different numbers of neutrons we call them isotopes of that element.
So the good thing about that, as opposed to something like carbon-14, it can be used to date really, really, really old things. So one of the protons must of somehow turned into a neutron. It'll just bubble out essentially, because it's not bonded to anything, and it'll sort of just seep out while we are in a liquid state. So right when the event happened, you shouldn't have any argon-40 right when that lava actually becomes solid.
And you know that this layer right over here solidified.