The age of the Laetoli footprints was determined by:

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The age of the Laetoli footprints, which are associated with early hominins, was determined using both potassium-argon dating and the law of superposition. Potassium-argon dating was used to date the volcanic layers above and below the footprint-bearing stratum, while the law of superposition helped to confirm the relative age of the footprints based on their position within the sedimentary layers.

The Age of the Laetoli Footprints Was Determined By