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http://dewa.com/animated/. Geologic Time. A method of ordering and measuring past events. How Old is this Photograph?. How can you tell? What are some clues?. http://www.cartes.freeuk.com/time/date.htm. http://www.familychronicle.com/dating40.htm.

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Geologic time

http://dewa.com/animated/

Geologic Time

A method of ordering and measuring past events


How old is this photograph
How Old is this Photograph?

  • How can

    you tell?

  • What

    are some

    clues?

http://www.cartes.freeuk.com/time/date.htm


Geologic time

http://www.familychronicle.com/dating40.htm

http://www.familychronicle.com/dating60.htm



Geologic time
Eon

  • Longest unit of geological time

  • Measured in billions of years

  • Present eon: Phanerozoic


Geologic time
Era

  • Second longest geological time measurement

  • Hundreds of millions of years

  • Present era: Cenozoic


Period
Period

  • Third longest geological time measurement

  • Measured in tens of millions to hundreds of millions of years

  • Defined by the life forms that were abundant or became extinct

  • Present: Quaternary


Epoch
Epoch

  • Fourth geological time measurement

  • Measured in million to tens of million of years

  • Present epoch: Holocene




Geologic time

http://www.geology.wisc.edu/~museum/old/geotime.html

http://www.geology.wisc.edu/~museum/old/geotime.html


Relative dating
Relative Dating

  • Determines the order in which geological events occurred based on stratigraphic principles, fossils and bands of rock


Absolute dating
Absolute Dating

  • Provides a numerical age for the material tested



The principle of superposition
The Principle of Superposition

http://homepage.usask.ca/~mjr347/prog/geoe118/geoe118.039.html


The principle of original horizontality
The Principle of Original Horizontality

http://en.wikipedia.org/wiki/Sedimentary


The principle of lateral continuity
The Principle of Lateral Continuity

http://www.library.csi.cuny.edu/dept/as/strat/lc.htm


The principle of cross cuttining
The Principle of Cross-cuttining

http://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html


The principle of intrusion inclusion
The Principle of Intrusion/Inclusion

http://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html


Principle of deformation unconformity
Principle of Deformation/Unconformity

http://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html


Correlation similar rock patterns
Correlation: Similar Rock Patterns

http://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html


Correlation fossils
Correlation: Fossils

http://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html


Geologic time

http://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.htmlhttp://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html


Absolute dating techniques
Absolute Dating Techniqueshttp://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html


Geological records with strong annual cyclicity
Geological Records with Strong Annual Cyclicityhttp://homepage.usask.ca/~mjr347//prog/geoe118/geoe118.039.html

  • Tree growth rings

  • Coral growth rings

  • Varves (annual clay sediment layers)


Geologic time

http://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htmhttp://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htm


Coral annual ring growth
Coral Annual Ring Growthhttp://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htm

http://earthobservatory.nasa.gov/Study/Paleoclimatology_CloseUp/paleoclimatology_closeup_2.html


Varves
Varveshttp://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htm

http://www.indiana.edu/~ensiweb/lessons/varves.html


Radiometric dating
Radiometric Datinghttp://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htm

  • Methods relying on the decay of naturally occurring radioisotopes


Most common radioisotope decay
Most Common Radioisotope Decayhttp://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htm

  • Carbon-14 -> Nitrogen-14

  • Potassium-40 -> Argon-40

  • Uranium-235 -> Lead-207

  • Uranium-238 -> Lead-206

  • Thorium-232 -> Lead-208

  • Rubidium-87 -> Strontium-87