ANTH 202 Lecture Notes - Lecture 10: Tooth Enamel, Terminus Post Quem, Koobi Fora
24 Oct 2017
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Lecture 10, 10/7/14: establishing chronological control, part b: a diversity of techniques. Radioactive potassium (40k) decays into argon (40ar) over time. Age of certain rocks/minerals can be discovered by measuring the amount of argon they contain: most useful in areas where volcanic eruptions left layers of ash or lava between. High-precision method to estimate relative quantities of argon-39 to argon-40 gas. Used to date volcanic ashes between 500,000 and several million years old. A 1. 8-million-year-old homo erectus skull (knm-er 3733, from koobi fora, Homo erectus, a hominin, lived in africa, asia, and europe between 2. These hominins walked upright, made simple stone tools, and may have. Involves collecting rock samples to find out how the earth"s magnetic poles were oriented when the rocks formed. Useful for dating hundreds to millions yrs: bedrock & some hearths & earth ovens. Also useful for determining whether rocks were heated/cooled in place; examples.
