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360
KAROO ICE AGE (360-260 MYA)
*Named after the glacial tills found in the Karoo region of South Africa.
*The rising levels of oxygen in the Karoo Ice Age had major effects upon plants and animals.
*oxygen levels reached up to 35% which is today associated with glacial periods. -
430
ANDEAN/SAHARAN (430-420 MYA)
*known to have formed in central Sahara and the Andes of western South America.
*These glaciers formed in the Andes region and they joined. -
Period: to
ICE AGES
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CRYOGENIAN 850-635 MYA
*The greatest ice age known to have occurred on earth and may have covered the entire planet.
*Called "Snowball Earth"
*These glaciers extended and contracted in a series of rhythmic pulses and reaching as far as the equator. -
HURONIAN GLACIATION 2400-2100 MYA
*2400-2100 Million Years Ago
*Most severe and longest ice age in geologic history.
*Triggered by the oxygen catastrophe: resulting in less cardon dioxide levels and reduced greenhouse effect.
*due to tilting of the earth at the time of 2 billion years ago the earth had a larger tilt. -
QUATERNARY (present)
*known as the current ice age or the ice age.
*Permanent ice sheets were established in Antarctia and Greenland.
*Known as permanent cause Antartica has existed continuously.
