THE TRUTH - University of Oregon

THE TRUTH - University of Oregon

Mass Extinctions Evidence for Many Events over Geological History Potential Triggers Asteroid Impacts = sudden Large Basalt Outflows Large CO2 changes which can affect atmospheric and ocean chemistry (slow)

Periodic Comet Strikes Fossil record shows some 26-27 million year period of some extinction event (usually small) Nemesis Theory (likely not correct) On the time scale of 20-30 million years (1/10 of our galactic orbit) nearby stars could perturb our Oort cloud of Comets

At least a dozen events The concept of impact induced extinction events is relatively new first evidence came in 1980 regarding the KT event (65 million years ago dead dinosaurs). Further research and data have no shown that such events are common.

Periodic Extinctions of Varying Amplitude (percent extincted) Mass Extinctions and Evolution to 2/3 of all species are eliminated during big events Plankton in the ocean is nuked So both the land and water are effected Encephelization Levels (EL) in organisms

measure the amount of brain tissue in excess of that needed for basic metabolism maintenance Evolution of Intelligence? This diagram has many features: EL Doubling time About 2 MY Unaltered EL Evolution would

have produced humans 60 MYA Last 200 million years has constant Fastest Growth: 600-250 MYA; beginning of slope sea to land migration

Implications

Evolutionary Clock gets reset Life recovers (relatively rapidly) to fill new ecological niches this empowers species diversification This means that survival of the fittest doesnt work on long timescales random catastrophe important Strangely, nature confirms that a new world will arrive out of the ashes of the old one

This will happen again (right after the final)

Recently Viewed Presentations

  • Update to ORNIS 14 Oct 2011

    Update to ORNIS 14 Oct 2011

    * * * * Task 1 New process of producing, approval, monitoring and updating the documents supporting the implementation of the Birds Directive Species Action Plans for Annex I birds Management Plans for Annex II birds Key Concepts Document of...
  • CASE STUDY: Politics and Society in Northern Ireland,

    CASE STUDY: Politics and Society in Northern Ireland,

    To nationalists, this was further evidence of how the unionist community and the police had no regard for their claims to equal rights. 3. Joseph Lee has written that 'The Protestant Apprentice Boys sustained a particularly vigorous master race mentality...
  • Multipath TCP - WINLAB

    Multipath TCP - WINLAB

    Multipath TCP Windows. Multipath TCP maintains one window per Multipath TCP connection. Windowis relative to the last acked data (Data Ack) Windowissharedamong all subflows. It's up to the implementation to decide how the windowisshared. Windowistransmittedinside the windowfield of the regular...
  • Biology 6B Laboratory Report II

    Biology 6B Laboratory Report II

    Format of Laboratory Report Typed Title Page Provide a descriptive title Your name Must include group numbers (not individual lab partners) for each experiment Results All tables have titles and numbers above table All figures have legends and numbers below...
  • TRIPs - ADDR

    TRIPs - ADDR

    Bolar Por uma alteração recente, passam a ser lícitos os atos praticados por terceiros não autorizados, relacionados à invenção protegida por patente, destinados exclusivamente à produção de informações, dados e resultados de testes, visando à obtenção do registro de comercialização,...
  • Healthcare Facility Sheltering, Relocation, and Evacuation

    Healthcare Facility Sheltering, Relocation, and Evacuation

    Affected units shelter in place or relocate at the decision of unit charge RN/supervisor to adjacent closest safe are (horizontal preferred, vertical secondary). Can relocated patients/residents be safely cared for over time? If yes, incident commander will make decisions. If...
  • Growth and Analysis of Large Undoped Single Crystal

    Growth and Analysis of Large Undoped Single Crystal

    Characteristics of SCDs like high thermal conductivity, high electric breakdown field and a wide bandgap makes them attractive for applications in high power electronics, as heat spreaders and radiation detectors. It is thus important to synthesize large single crystal diamond...
  • Development of Oxygen Electrodes for High Temperature and

    Development of Oxygen Electrodes for High Temperature and

    ECerS conference 2017, Budapest. Motivation for the work. Selection of materials. Electrochemical activity towards the OER. Chemical stability of materials at high temperature. Processing porous LaNi. 0.6. Fe. 0.4. O. 3. electrodes. 2017-07-13. Motivation and past results (high current density...