Lab7_GeoTime - Geologic Time The Geological Time Scale...

Info icon This preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Geologic Time Geologic Time
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The Geological Time Scale Composite of stratigraphic records that geologists use to determine history of the Earth. Relative and absolute dating methods are used to determine the age of rocks. Relative dating: using relationships between rocks to determine a sequence of events Absolute dating: numerical age given in years or years before present
Image of page 2
The Precambrian makes up ~75% of Earth history Eons Eras
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Eras Periods
Image of page 4
Periods Epochs
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Relative Dating 1) Principles of Original Horizontality & Superposition Layers deposited horizontally Youngest layers on top
Image of page 6
Relative Dating 2) Principle of Lateral Continuity Rock strata are continuous
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Relative Dating 3) Principle of Inclusions A younger layer may contain pieces of an older layer (inclusion)
Image of page 8
Relative Dating 4) Principle of Cross-cutting relationships Any feature that cuts across a rock layer must be younger examples: -Faults -Igneous body -Unconformities
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Relative Dating
Image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern