BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ox.ac.uk//NONSGML oxford.event//EN
X-WR-TIMEZONE:Europe/London
BEGIN:VTIMEZONE
TZID:Europe/London
X-LIC-LOCATION:Europe/London
BEGIN:DAYLIGHT
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZNAME:BST
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:GMT
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
SUMMARY:A Tale of Two Lakes: Chemical Stratification and Records of Life i
 n Mesoproterozoic and Modern Times
DTSTART;TZID=Europe/London:20260508T120000
DTEND;TZID=Europe/London:20260508T130000
DTSTAMP:20260508T151920Z
UID:b673662a-1134-f111-88b4-7c1e5202950a
CREATED:20260409T123937Z
DESCRIPTION:Abstract: In the Proterozoic Eon\, atmospheric oxygen levels a
 re thought to have been lower than modern levels creating chemical stratif
 ications of the oceans.  The oceans’ redox and chemistry and the impact 
 of these conditions on the evolution of life is still debated. In this pre
 sentation\, I will highlight two case studies applying magnetic techniques
  to provide details on paleoredox\, the fossil record\, and diagenesis.  I
 n the first study\, we will look at the ~1075 Ma Nonesuch Formation and it
 s microfossil assemblage\, which provide an excellently preserved window i
 nto the environments and biosphere of a tropical lake containing an oxycli
 ne. In the second study\, we looked at a modern euxinic (anoxic and sulfid
 ic) meromictic lake in New Hampshire as a paleo-ocean analogue to probe au
 thigenic iron mineral formation.
LAST-MODIFIED:20260409T124410Z
LOCATION:Department of Earth Sciences\, Oxford EARTH - Researchers Common 
 Room\, Researchers Common Room Department of Earth Sciences\, Oxford EARTH
  South Parks Road Oxford Oxfordshire OX1 3AN United Kingdom
SPEAKER:Dr Sarah P. Slotznick (Dartmouth College)
END:VEVENT
END:VCALENDAR