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Karoo Ice Age
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Karoo Ice Age
Calyssa Talmadge, Jessica Wang, Zainab Hashmi
How many ice ages have been recorded in the rock record? Which one is this?
- Five ice ages recorded
- 2nd major ice age of the Phanerozoic Eon
- Phanerozoic Eon is the current geologic eon
What is a cyclothem?
Where were the continents located during this time?
Why was it named Karoo?
- Alternating sequences of marine and non-marine sediments
Was the whole earth covered in ice? Describe the climate in the north.
- South America, Australia, India, Australia in the South
- Rest of the continents in the north
- First evidence of its existence was found in Karoo region of South Africa
- No, only the south
- North remained relatively ice free
What organisms were living during that time?
How do glaciers form?
- Mammoths primogenitors
- Mammut americanum
- Homo neaderthensis
- Formed from compacted layers of snow
- Snow doesn't melt and it's own weight compresses it
- Begins to flow under influence of gravity
Where did the ice sheet form?
- First formed in Africa and South America
- Second part-centered in Australia and India
What are some theories to why it occurred?
- Increase in oxygen+decrease in carbon dioxide in the atmosphere
- Less carbon dioxide=heat added to atmosphere
- Greenhouse effect dropped, cooling Earth's global atmosphere
Karoo Ice Age
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