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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

slide3

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

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

slide5
Eon
  • Longest unit of geological time
  • Measured in billions of years
  • Present eon: Phanerozoic
slide6
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
slide11

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

slide23

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

geological records with strong annual cyclicity
Geological Records with Strong Annual Cyclicity
  • Tree growth rings
  • Coral growth rings
  • Varves (annual clay sediment layers)
slide26

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 Growth

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

varves
Varves

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

radiometric dating
Radiometric Dating
  • Methods relying on the decay of naturally occurring radioisotopes
most common radioisotope decay
Most Common Radioisotope Decay
  • Carbon-14 -> Nitrogen-14
  • Potassium-40 -> Argon-40
  • Uranium-235 -> Lead-207
  • Uranium-238 -> Lead-206
  • Thorium-232 -> Lead-208
  • Rubidium-87 -> Strontium-87
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