In order to obtain absolute dates from volcanic material in very early contexts (over 1 million years ago),you would probably choose to use

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Potassium-argon dating is the best choice for obtaining absolute dates from volcanic material in very early contexts over 1 million years ago. This method is especially useful for dating materials that are too old for radiocarbon dating and too young for uranium-series dating. It works by measuring the decay of potassium-40 isotopes to argon-40 in volcanic material, which can provide accurate dates for material that is up to billions of years old.

In Order to Obtain Absolute Dates from Volcanic Material in Very