1 / 12

The Geologic Time Scale

The Geologic Time Scale. A Clock In the Rocks. Relative Dating. A technique used to determine the age of a fossil by comparing it to other fossils found in the layering of a rock Sedimentary rock = undisturbed Lower = oldest Upper = newest Vertical geologic section.

dragon
Download Presentation

The Geologic Time Scale

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. The Geologic Time Scale A Clock In the Rocks

  2. Relative Dating • A technique used to determine the age of a fossil by comparing it to other fossils found in the layering of a rock • Sedimentary rock = undisturbed • Lower = oldest • Upper = newest • Vertical geologic section. • Layer A is the oldest, layer C is the youngest. C B A

  3. Relative Dating (Cont) • Time of appearance and disappearance • Determines relative times of organisms

  4. Problems with Relative Dating • Gaps in record • Quality of Fossils

  5. Relative Dating vs. Absolute Dating

  6. Radioactive Dating • Absolute Dating • Rocks • Made of many elements • Radioactive • Elements that decay or break down at a steady and measurable rate - Used to age fossils and layers of Earth

  7. Radioactive dating • How is it measured? • Half-life- unit of measurement of decay • The amount of time required for half of the radioactive atoms to decay

  8. Radioactive Elements • Each element has a different half-life.

  9. Useful Dates once living material Drawback 60,000 years Carbon-14

  10. Earth Age? • All this data helped scientists come to the conclusion the earth is 4.5 billion years old

  11. Image Sources • http://3dparks.wr.usgs.gov/nyc/images/fig5.jpg • http://static.howstuffworks.com/gif/carbon-14.gif • http://qbx6.ltu.edu/s_schneider/courses/intro_astro/images/06-28.jpg • http://qbx6.ltu.edu/s_schneider/courses/intro_astro/images/06-28.jpg • http://www.uwlax.edu/MVAC/ProcessArch/ProcessArch/images/stylesW.jpg • http://upload.wikimedia.org/wikipedia/en/thumb/e/e8/Knightia.jpg/250px-Knightia.jpg • http://daneshnameh.roshd.ir/mavara/img/daneshnameh_up/4/4b/earth-age.jpg • http://evolution.berkeley.edu/evosite/lines/images/strat_column.gif

More Related