Potassium-argon (K/A) dating of accompanying rock would most likely be the most effective dating technique for determining the age of a fossil skull identified with Homo Erectus, a species that evolved around 1.9 million years ago.
The potassium-argon dating method determines the age of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock.
This dating method is based on the decay of radioactive potassium-40 in minerals and rocks to radioactive argon-40; potassium-40 also decays to calcium-40. Potassium-argon dating is accurate from 4.3 billion years ago (the age of the Earth) to about 100,000 years ago.
Only 0.0053% of the potassium-40 in a rock would have decomposed to argon-40 after 100,000 years, exceeding the limits of current detection techniques.
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