Lecture 17
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Lecture 17 The way of the wind is a strange, wild way. - Ingram Crockett Glacial deposition, and Wind Webpage for course (dayt ime) Webpage for course (nigh ttime)
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The way of the wind is a strange, wild way. - Ingram Crockett Glacial deposition, and Wind . Lecture 17. Webpage for course (daytime). Webpage for course (nighttime). Why such interest in Glaciers?. Glaciers as erosion deposition process is very unusual - PowerPoint PPT Presentation
Transcript of Lecture 17
Lecture 17
The way of the windis a strange, wild way.
- Ingram Crockett
Glacial deposition, and Wind
Webpage for course (daytime)
Webpage for course (nighttime)
Why such interest in Glaciers?
Glaciers as erosion deposition process is very unusual
Glaciers were important in fairly recent history
Because we live in Maine
Glaciers
Can erode larger portions of mtns
Transport and deposit the material
Over 10,000s years
Grains can be the size of trucks
Glaciers
Can erode larger portions of mtns
Transport and deposit the material
Over 10,000s years
Grains can be the size of trucks
In lowlands – deposition on large scale
till
MorainesFig. 11-18
Moraines
terminal
lateral
medial
recessional
Special features unique to glacial deposition
erratics
kames
eskers
kettles
drumlins
erratics
Fig. 11-19
Fig. 11-23bl
kame
Fig. 11-23br
kettles
Fig. 11-23tl
esker
Fig. 11-23tr
drumlin
Mechanisms of Transportation and Deposition
Water - streams, rivers, etc., freshwater and marine
Wind Gravity – downslope movementIce – glaciers
Some sedimentary rocks form of atoms dissolved in water and precipitated elsewhere
Some meteorology…
Low pressure High Pressure
deserts
Frosted grainsventefacts
Interesting features
Fig. 12.14, p. 281
Why is the desert floor covered with rocks?
Fig. 12.12, p. 280
Why is the desert floor covered with rocks?
Deflation
Fig. 12.13, p. 281
Dust Bowl
Fig. 12.15, p. 282
