Stratigraphy
Download
1 / 12

Stratigraphy - PowerPoint PPT Presentation


  • 531 Views
  • Updated On :

Stratigraphy. The study of strata (layers) of rocks with an eye toward interpreting the geologic history of the region Closely tied to dating methods Uses a variety of methods - fossils, stable isotopes, paleomagnetics, sedimentary cycles - to correlate and distinguish layers

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Stratigraphy' - Jeffrey


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Stratigraphy l.jpg
Stratigraphy

  • The study of strata (layers) of rocks with an eye toward interpreting the geologic history of the region

  • Closely tied to dating methods

  • Uses a variety of methods - fossils, stable isotopes, paleomagnetics, sedimentary cycles - to correlate and distinguish layers

  • Very important for oil exploration and mining


Stratigraphic principles l.jpg
Stratigraphic Principles

  • Principle of original horizontality

    • Every sedimentary layer is deposited horizontally


Stratigraphic principles3 l.jpg
Stratigraphic Principles

  • Principle of cross-cutting relationships

    • Any layer that is cut by something else has to be older than that something else

    • Applies to igneous intrusions, faults, veins, erosional surfaces, etc.

Granitic intrusion

From D. McConnell, Geologic Time,

http://lists.uakron.edu/geology/natscigeo/Lectures/time/gtime1.htm


Stratigraphic principles4 l.jpg
Stratigraphic Principles

  • Principle of stratigraphic superposition

    • Oldest rocks are on the bottom

    • Youngest rocks are on the top

Dead Horse Point, UT

From D. McConnell, Geologic Time,

http://lists.uakron.edu/geology/natscigeo/Lectures/time/gtime1.htm


Stratigraphic principles5 l.jpg
Stratigraphic Principles

  • Principle of original lateral continuity

    • Sedimentary layers don’t just stop suddenly

    • They extend horizontally until they taper out

Millroy, PA

Pictures from D. McConnell, Geologic Time,

http://lists.uakron.edu/geology/natscigeo/Lectures/time/gtime1.htm

Graybull, WY


Stratigraphic principles6 l.jpg
Stratigraphic Principles

  • Principle of unconformities

    • Some stratigraphic sections are incomplete

    • Any place where there is missing time is called an unconformity

    • Unconformities normally happen either through erosion or non-deposition


Slide7 l.jpg

The Great Unconformity

Grand Canyon, AZ


Slide8 l.jpg

Angular

Unconformity




Stratigraphic thinking l.jpg
Stratigraphic Thinking

From D. McConnell, Geologic Time,

http://lists.uakron.edu/geology/natscigeo/Lectures/time/gtime1.htm



ad