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Absoulte dating

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Is a process of establishing the age of an object, such as a fossil or rock layer, by determining the number of years that is exsisted. Absoulte dating. Radioactive Decay. Radioactive isotopes tend to break down into stable isotopes of other elements in a process Radioactive Decay

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Is a process of establishing the age of an object, such as a fossil or rock layer, by determining the number of years that is exsisted

Absoulte dating

radioactive decay
Radioactive Decay
  • Radioactive isotopes tend to break down into stable isotopes of other elements in a process RadioactiveDecay
  • Because radioactive decay occurs at a steady pace, scientists can use the relative amounts of stable and unstable isotopes present in an object to determine object’s age.
radiometric dating
Radiometric Dating
  • Determining the absolute age of sample based on the ratio of parent material to daughter material
  • Half-Life is the time it takes for one-half of a radioactive sample to decay
types of radiometric dating
Types of Radiometric Dating
  • Uranium-Lead Method
  • Potassium-Argon Method
  • Carbon-14 Method
uranium potassium and carbon
Uranium,Potassium, and Carbon
  • Uranium-238 method is used for dating rocks back more than 10million years ago
  • Potassium -40 method is used to date rocks older than 100,000 year ago
  • Carbon-14 method is used mainly to date rocks that have lived within the last 50,000 years.
fossilized organisms
Fossilized Organisms
  • Afossil is any naturally preserved evidence of life.
materials that preserve evidence of life
Materials that preserve evidence of life
  • In Rock
  • Mineral Replacement
  • Permineralization is a process in which minerals fill in pore spaces of an organism’s tissues.
  • Petrification of an of organisms, occurs when the oraganisms tissues are completely replaced by minerals
  • Fossils in Amber(tree sap)
  • Mummification
  • When organisms die and dry out they are protected from bacteria because of the lack of water
  • Frozen Fossils
  • Fossils in Tar
  • One such place is the La Brea tar pits,in Los Angeles County, California. These tar pits were present 40,00o years ago
other type of fossils
Other Type of Fossils
  • Trace fossil are any naturally preserved evidence of an animal’s activity
  • Coprolites are preserved feces, or dung from , from animals
  • Mold is a cavity in the ground or orckehere a plant or animal was buried.
  • Cast is an object created when sediment fills a mold and becomes rock
using fossils as a door way to the past
Using Fossils as a Door Way to the Past
  • Environmental Changes
  • Ex. By studying coral-reef fossils and applying the principle of uniformitarianism, they have determined that Iowa was once covered by a shallow sea.
  • Species existence on Earth
  • We know that fish existed before amphibians because fish were found in a lower layer of rock. In the same way, we know that amphibians existed before reptiles
using fossils to date rocks
Using Fossils to Date Rocks
  • Index fossils are fossils of organisms that lived during a relatively short, well-defined time span.
  • Ex. Tropites, a genus of ammonites, existed for only about 2o million years, which makes it a good index fossils.
  • Where geologists find them in a rock layer, they know that the rock layer is between 208 million and 230 million years ago
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