UA GEO 102 - geologic time (2 pages)

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geologic time

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geologic time


geologic time

Lecture number:
Lecture Note
University of Alabama
Geo 102 - The Earth Through Time

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GEO 102 Lecture 11 Outline of Last Lecture I How the Earth works Outline of Current Lecture II Geologic Time III How old is that IV How do we know V Relative dating and basic principles of rock formations Current Lecture Geologic Time If you live to be about 80 years old that means that you have lived only a bit more than one ten millionth of 1 percent of the age of the earth Earth is 4 55 billion years old How Old is That If we think of the age of the earth as a roll of toilet paper each sheet would represent 4 500 000 years If a football field represented the earth s age the entire history of civilization would fit into less than 1 5 of one millimeter less that one blade of grass edgewise How do we know There is a long history of discovery concerning the age of the Earth Scientists long suspected that the Earth was ancient but it was a radical idea to everyone else In the late 1700s to early 1800 s this became well established with relative dating These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Relative Dating Sequence of formation Steno s laws not trying to put a number on it just sequence Still a very valuable tool Application basic logical principles Basic Principles of Rock Formation superposition In an undeformed sequence of sedimentary rocks each layer is older than the one above and younger than the one below Try inserting sand underneath other sand without disturbing it

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