Geologic Time Scale - Geosc 10 Thursday April 15th 1999...

Info icon This preview shows pages 1–2. Sign up to view the full content.

Geosc 10 Thursday, April 15th, 1999 Announcements: none Lecture notes: I. Geologic Time Scale (know these terms) A. Pre-Cambrian (570 million years)--these are the rocks that were present from the first explosion of multi-cellular life; these rocks occupy the vast majority of earth history prior to the beginning of abundant life forms B. Cenozoic --"Young Life" C. Mesozic --"Middle Life"; abundance of life; marks the extinction of the dinosaurs D. Paleozoic --"Old Life"; period between start of life and the events of Pangea E. Each horizontal line on the handout represents an extinction; the larger the space the larger the extinction II. All elements contain the following things A. Electrons B. Neutrons *Neutrons and protons equal the atomic mass C. Protons III. Measuring Radioactive Decay A. "Fission Track" --one atom splits apart; usually deals with Uranium; process begins by placing a rock on photo- graphic paper (Zircon and apatite are good minerals to do this with); then count the number of decays; the number
Image of page 1

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

Image of page 2
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