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Undercover_in_SF t1_ja8ggxq wrote

Reply to comment by Pandarmy in How is radioactive dating used to determine historical greenhouse gas levels and temperatures? by pog_irl

And accuracy decreases the farther back you go. Once you get around 50,000 years you’re at 10 half lifes, so any residual C14 is so small it’s not accurate.

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Pandarmy t1_ja9bocd wrote

Right, which is why they probably use potassium or krypton instead of carbon. I'm just not as familiar with their isotopes or halflives which is why I used carbon in my example.

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