Earthshit 3

• ABSOLUTE DATING 

  • gives the actual age of the rock or fossil, or the period of an event
  • It is also referred as radiometric dating. 
  • this method used to determine the age of rocks by measuring the radioactive decay
• Stratified rocks are almost the same as sedimentary rocks. They are layered Earth materials that are deposited as successive beds of sediment that have been solidified by compaction, cementation, or crystallization. also called bedding, is the layering that occurs in most sedimentary and igneous rocks.
• The study of rock layers and their relationships to each other is called stratigraphy.
• RELATIVE DATING is the method wherein events based on the rock sequence are arranged as geological events. 
• RADIOACTIVE DATING Is the most accurate method of absolute dating.  a method of dating rocks and minerals using radioactive isotopes.
• CARBON DATING  is a scientific method that can accurately determine the age of organic materials as old as approximately 60,000 years. 
• INDEX FOSSILS These fossils acts as “bookmarks” in the stratified rock layers so that geologist can easily determine the age or period of the rock layers. 
• HOW FOSSILS FORM

  • Mummification
  • Amber
  • Tar seeps
  • Freezing
  • Petrification
• TYPES OF FOSSILS

  • Imprints
  • Molds and Casts
  • Coprolites
  • Gastroliths
• geological time scale is a model of Earth’s history. Scientists put together the geologic time scale to describe two things:

  • order
  • duration
• ORDER OF TIME:

  • EON 
  • ERAS                                                                                     
  • PERIOD
  • EPOCH
  • AGES
• PRECAMBRIAN TIME Is the interval of time in the geological time scale from Earth’s formation to the beginning of the Palaeozoic era.