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Author Question: What triggered the Huronian glaciation at 2.3 b.y. ago? What will be an ideal ... (Read 8 times)

D2AR0N

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on: Jul 14, 2018
What triggered the Huronian glaciation at 2.3 b.y. ago?
 
  What will be an ideal response?

Question 2

What types of geologic evidence are used to infer past glaciations?
 
  What will be an ideal response?


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memslove

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Reply #1 on: Jul 14, 2018
Answer to Question 1

The most likely trigger for the Huronian glaciation was the decrease in CH4 that resulted from the rise of O2. The increased O2 concentrations would have eliminated much of the CH4 present in the atmosphere, thereby reducing the greenhouse effect.

Answer to Question 2

Tillites, glacial striations, dropstones, and 18O excursions are evidence of glaciations mentioned in the book.


D2AR0N

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Reply 2 on: Jul 14, 2018
Great answer, keep it coming :)

dawsa925

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Reply 3 on: Yesterday
Excellent

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