Slide 1A shallow glimpse into the wonders of Anthropology Slide 2 Trying to establish dates and ages for artifacts in order to understand our chronology Where and when did the early humans originate Slide 3 Trying to establish dates and ages for artifacts in order to understand our chronology Where and when did the early humans originate Slide 4 Site / NameEstimated Age OH 621.7 Million Years OH 71.75 OH 241.8 KNM ER 18131.9 KNM ER 18051.74 Slide 5 Relies on Stratigraphy, Follows geologic principals of rock & sediment layering to estimate dates Biostratigraphy, Previously dated fossils Distinct Flora and Dendrochronology Study of tree Rings Slide 6 Useful for Geologic & Prehistoric events and when absolute techniques cannot be applied Law of Super Position Seriation Setting an object into a series Supported by Multivariate Statistical Analysis Slide 7 Isotope Same number of protons but more neutrons in the nucleus of an atom Unstable Isotope An atom that is trying to return to its stable atomic mass Half Life Length of time required for a quantity to decay to half its initial value. Slide 8 IsotopeDecays ToHalf Life (Years) Carbon – 14Nitrogen – 145715 Uranium – 235Lead – 207704 Million Potassium – 40Argon – 401.3 Billion Uranium – 238Lead – 2064.5 Billion Thorium – 232Lead – 20814 Billion Rubidium – 87Strontium – 8749 Billion Slide 9 1. Measure amount of isotope 2. Compare to half life quantity to determine time period. Slide 10 Electrons are captured in crystalline structures of objects Applying heat to them allow electrons to escape o Measure samples intensity of luminescence o Relate luminescence intensity to radiation dose o Determine the dose per year that the sample has been exposed to Slide 11 Kari Mosleh Avital Birger Melika Farnia Bob Chatman Java Man – 1.7 m.y. R.I.P. Arthur C. Clarke =( Slide 12 http://www.channel4.com/history/microsites/B/bodies/cases/case12.html BBC - Dawn of Man (2000) by Robin Mckie| ISBN 0-7894-6262-1

A shallow glimpse into the wonders of Anthropology.

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Slide 1A shallow glimpse into the wonders of Anthropology Slide 2 Trying to establish dates and ages for artifacts in order to understand our chronology Where and when did…