GEOG 2OC3 Lecture Notes - Lecture 1: Laurentide Ice Sheet, East African Rift, James Ussher
15 Dec 2018
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Document Summary
In reality, it is likely that each of these situations happened, however scientists and archaeologists are constantly uncovering clues as to how these peoples made it into north. A chronology of discoveries: 1650s - james ussher determines earth was created 23 october 4004, according to scripture from the christian bible, 1700s - james hutton ("father of geology") argues that earth must be much older than. "clovis first" theory accepted as earliest evidence for humans in north america: 1940 - radiocarbon dating invented, 1960 - clovis first theory accepted due to the advent of dating techniques and availability of evidence. C14 that is in situ (already in the body) begins to decay into another isotope, n14: the decay rate of c14 is constant. By looking at the ratio of c14 (parent) to n14 (daughter), it is possible to determine how long the isotope has been decaying: widely used in archaeology up to 50 thousand years ago (half life limit of c14).
