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The oldest ice cores ever taken go back 800,000 years. Let's look on that geological clock diagram and see where that puts us.
Well, that barely visible bump indicating the first hominids is 2 million years back. So our ice core would be 40% of that.
Yeah, that works.
We could even work out the actual time on the clock. Let's say the clock is scaled to 24 hours. Let's see:
(800,000/4,527,000,000) = (x/24)
x=24 * (800/000/4,527,000,000)
x= 0.00424121935056328694499668654738 hours
x=15.268 seconds
Yeah. Man, now THAT'S geological!
Let's see.... did I do that math right? Hmm... yup! If we scale the Earth's GEOLOGICAL history to 24 hours, the longest ice core (800,000 years) scales down to 15.268 seconds.