GEO 303 Lecture Notes - Lecture 11: Afar Region, Strontium, Rubidium
10 May 2016
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Exam 1 wed sep 30th (know details from lectures: review material on canvas, lectures 1-9, optional review mon 7:30. Next lecture: origin of life (12 to 194) Deep time: earth"s history, how its unfolded, origin of life, chemical and physical changes throughout history, rock record: rocks at the bottom. Law of superposition, in a horizontal stack of sedimentary rocks: unconformity: missing time in rock record. Telling geo time: discovering deep time, early geologic clocks: hourglass methods, the radioactivity clock. Parent decay and daughter growth: useful parent-daughter pairs, calculating an isotopic age, the meaning of isotopic ages. Discovering deep time: have no idea how old earth is, several guesses (biblical guesses to. Nasa: people made observations, and then hutton hit on an idea that was revolutionary. His unconformity discovery of figuring out how everything is related meant that the process of what acts on the planet now (beach moves sediment, earthquakes, etc. ) One lake: 215 meters thick*15 varves/cm*100cm/meter*1year/varve=322,500 years: hourglass method.
