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SUMMARY:Sea ice in a Cretaceous greenhouse world? - Jane Francis\, British
  Antarctic Survey
DTSTART:20131119T163000Z
DTEND:20131119T173000Z
UID:TALK47322@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:The high-CO2 world of the Cretaceous allowed plants and animal
 s to thrive on Antarctica\, even though the continent was situated over th
 e South Pole. Warmth-loving plants\, similar to those those that live in t
 he tropics today\, suggest that at times during the Late Cretaceous summer
  temperatures may have been as high as 20°C at 65°S\, supporting the wid
 ely-held view that the Cretaceous was a time of global warmth and ice-free
 . However\, new evidence from sediments of latest Cretaceous age (~70 Ma) 
 indicates that by the end of the Cretaceous the polar climate was cold eno
 ugh to allow sea ice to form. Peaks in the abundance of certain marine pla
 nkton\, correlated with low temperatures from oxygen isotopes\, imply that
  at times sea ice formed around the Antarctic margin\, further suggesting 
 that ice caps were present on the Antarctic continent itself.
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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