Notes for January 17 - Julia C Collazo Professor James C Adamski Geology of National Parks(GLY2160 17 January 2017 Notes for Geologic Time Geology

Notes for January 17 - Julia C Collazo Professor James C...

This preview shows page 1 - 3 out of 8 pages.

Julia C. Collazo Professor James C. Adamski Geology of National Parks (GLY2160) 17 January 2017 Notes for 1/17/2017 Geologic Time Geology • Physical Geology—study of Earth’s structure and processes • Historical Geology—study of Earth through time Historical Notes Catastrophism o Landscape developed by catastrophes o James Ussher, mid-1600s, concluded Earth was created in 4004 BC Uniformitarianism o Landscape developed by small, incremental changes over long periods of time Fundamental principle of geology "The present is the key to the past" o James Hutton Theory of the Earth Published in the late 1700s “We find no vestige of a beginning, no prospect of an end” Not well accepted o Charles Lyell Principles of Geology (1830) popularized Hutton’s ideas Modern Geology • Uniformitarianism + catastrophism • Most processes happen at slow states over long periods of time (uniformitarianism) • Periodic catastrophes (asteroid impacts, supervolcanoes etc) can have devastating effects and cause mass extinctions
Image of page 1

Subscribe to view the full document.

Geologic Time • Relative dating—placing rocks and events in proper sequence • Absolute dating—determining actual age of rocks or events in years before present Relative Dating • Law of superposition o Developed by Nicolaus Steno in 1669 o In an undeformed sequence of sedimentary rocks (or layered igneous rocks), the oldest rocks are on the bottom • Principle of original horizontality o Layers of sediment are generally deposited in a horizontal position o Rock layers that are flat have not been disturbed • Cross-Cutting Relationships o Principle of cross-cutting relationships
Image of page 2
Image of page 3

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

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes