Lecture#23 - Lecture#23 11/17/08 Describe the Pleistocene...

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Lecture#23 11/17/08 Describe the Pleistocene glacial till record in N.A. There are four glacial tills, each with their own soil horizon. Name the N.A. glacial stages in the correct order. Wisonsinan, Illinoian, Kansan, Nebraskan What change in global average temperate occurred in order to have a glacial stage? The temp goes down 4°C Describe the components of the Milankovitch cycles. Eccentricity temp changes caused by changes in Earth’s orbit, it changes every 100,000 yrs and switches: more circular (more equal distrib of solar rad) to more elliptical (less equal distrib of solar rad) Tilt changes in Earth’s axis, changes every 40,000 yrs, 21.5° (even distrib of solar rad)-24.5°(greater distrib of solar rad) Precession axis wobbles every 26,000 yrs (changes distrib of solar rad) How would they be responsible for glacial/interglacial stages? Putting all cycles together causes a 4°C fluxation of heating and cooling Describe the data that supports the Milankovitch cycles
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Lecture#23 - Lecture#23 11/17/08 Describe the Pleistocene...

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