Geography 2133A/B Lecture Notes - Lecture 9: Atomic Mass, Paleoclimatology, Uniformitarianism
10 Feb 2016
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Varves different layers based on seasonal changes, chemical and physical changes (light vs dark layers . ) It is recorded (monitoring, historical data), we can determine it using incremental or radiometric techniques. Radioactive dating (isotopes knowing the decay period, we can tell how old it is) Nitrogen 14 becomes c 14 when bombarded w. energy . When we die, we no longer exchange carbon w/ the atmosphere, so when die this decays . C14 = most important dating piece (200-40,000 years ago) Calibration, verification and regression tree rings widths temperatures, precipitation. Principle of uniformitarianism relationships we have today, existed in the past. This underlies all of the research being done here with paleoclimate. A. e douglass , was an astronomer, father of dendrochronology study of tree rings .
