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SUMMARY:The Frasnian-Famennian Mass Extinction - John Marshall\, Universit
 y of Southampton
DTSTART:20140128T163000Z
DTEND:20140128T173000Z
UID:TALK50066@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:There are some six mass extinctions recognised in Phanerozoic 
 time. The one that perhaps remains least understood is the Late Devonian F
 rasnian-Famennian mass extinction event at 375 Ma. Here new data is report
 ed that integrates a long terrestrial section from East Greenland with a m
 arginal marine record from northern Russia. Significantly the Russian mate
 rial includes an integrated stable isotope record from both bulk carbonate
  and terrestrial organic matter. The latter shows the characteristic doubl
 e negative excursion well known from other mass extinction events. Multipl
 e lines of evidence from the material indicate an initial LIP event that w
 as followed by the circulation of euxinic water masses onto the shelf envi
 ronment. The terrestrial palaeoclimate record from East Greenland show two
  episodes of sustained wet climate followed by extreme aridity that parall
 el the extinction events in the marine realm.    
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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