Lecture%205%20Natural%20history%20of%20IN

Lecture%205%20Natural%20history%20of%20IN - Quiz 1 Lecture...

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Quiz 1
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Lecture 5 Natural History of Indiana January 25 2011
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What comes to mind when you think about the Indiana landscape?
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Historic IN
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Eastern deciduous forests
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Eastern deciduous Marked seasons Frosts in winter Northern limit is -40F which occurs at about 48 N latitude. Absence of drought Precipitation decreases from east to west (49 inches to 33 inches at grassland boundary) Moderate to long growing season (120 to 250 days)
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Soils Alfisol Ultisol – southern US along 
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Soil type = parent material + time + climate + living organisms + topography
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Antarctic Ice Sheet A valley glacier, Alaska
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Glacial till
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So, what happened in Indiana? There were three major glacial events: 1. The first ice sheet (Kansan) appeared before 700,000 ybp and came straight from the north (Michigan) Effect: major flattening of the Indiana terrain
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1.The second ice sheet (Illinoian) appeared about 200,000 ybp. It covered all but 1/6 of Indiana. Effects: It further flattened the area, except in Southern Indiana. The drainage areas for the ice melt became the major waterways in the state.
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3. The third ice sheet (the Wisconsin glacial event) occurred between 50,000 and 15,000 ybp. It covered the northern 1/2
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This note was uploaded on 02/19/2011 for the course BTNY 211 taught by Professor Gibson during the Spring '11 term at Purdue.

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Lecture%205%20Natural%20history%20of%20IN - Quiz 1 Lecture...

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