{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

gel_lec_20 - Lecture 20 Dinosaur Extinction K/T...

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

View Full Document Right Arrow Icon
Lecture 20 – 3/1/10 Dinosaur Extinction K/T worst (dinosaur extinction), end Permian second worst What was the world like near the K/T boundary? Sea level curve - During age of dinosaurs, sea level not high in beginning, but increased dramatically near end (Triassic – Cretaceous) Temperature - Greenhouse was extreme (warmest time ever in history of life) - Decreased a little near end of cretaceous, but upped again Continent - Lots of water, many areas flooded - Shallow coastal water (good for biodiversity) What is the evidence of bolide impact? Impact evidence - Iridium - Shocked quarts - Spherule and tektite - Crater Iridium - Gubbio, Italy - Concentrated carbon (K/T boundary): the black line between age of dinosaurs and after - Iridium skyrockets to an unusual level on this boundary, but drops down after - Either bring it from outer space (extraterrestrial) but from deep in the earth (huge volcanism) Shocked quartz - Quartz not just beautiful, but really hard; to alter the structure, must apply a lot of force -
Image of page 1

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

View Full Document Right Arrow Icon
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