Laetoli footprints dating technique

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Dating techniques are procedures used by scientists to determine the age of rocks, fossils, or artifacts. Relative dating methods tell only if one sample is older or younger than another; absolute dating methods provide an approximate date in years. The latter have generally been available only since Many absolute dating techniques take advantage of radioactive decay , whereby a radioactive form of an element decays into a non-radioactive product at a regular rate.
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Which technique was used to date the Laetoli footprints?

Evolutionists determined the age of this sedimentary layer from the ages of the layers of volcanic ash above and below it using potassium-argon dating. It was originally believed that all argon escapes from volcanic ash and lava at the time of eruption. Therefore, any argon gas found in the ash must have come from radioactive decay of potassium. The longer the time since the eruption, the more argon gas there would be trapped in the solid ash. The assumption that all the argon gas escapes at the time of eruption was shown to be false by measuring the amount of argon gas present in ash and lava from modern volcanic eruptions. So, evolutionists attempt to figure out how much argon was in the ash originally, and how much has been produced by radioactive decay since the eruption. The conventional K-Ar dating method depends on the assumption that the rocks contained no argon at the time of formation and that all the subsequent radiogenic argon i.
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The Laetoli Footprints

The Laetoli footprints were formed and preserved by a chance combination of events -- a volcanic eruption, a rainstorm, and another ashfall. When they were found in , these hominid tracks, at least 3. Paleoanthropologist and consultant forensic scientist Owen Lovejoy compares the ancient biped prints with those of modern humans and chimpanzees. All rights reserved. View in: QuickTime RealPlayer.
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Intro How did they move? What did they look like? Are they all the same species? When did they live?
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