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SUMMARY:The eve of biomineralisation - Rachel Wood\, School of GeoSciences
 \, University of Edinburgh
DTSTART:20120522T153000Z
DTEND:20120522T163000Z
UID:TALK36863@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:The first appearance of metazoans during the Ediacaran (575-54
 3 million years ago (Ma)) and calcified skeletons (~553 Ma) has been linke
 d to the widespread development of oxygenated oceanic conditions. The prec
 ise environmental context\, however\, for early animal evolution remains u
 nclear.  Spatial and temporal reconstruction of carbon isotope and ocean r
 edox dynamics from the Nama Group\, Namibia\, shows that the first skeleta
 l animals evolved under conditions of unstable oxygenation. In addition\, 
 the choice of biomineral during the Cambrian Radiation was controlled by e
 cology and metabolic cost. Predation pressure was the escalating force as 
 biominerals were selected according to their principal function (passive d
 efence\, active defence\, or active predation) under changing physicochemi
 cal conditions.\n\nWOOD\, R.A.\, GROTZINGER\, J.P. and DICKSON\, J.A.D. 20
 02. Proterozoic modular biomineralized metazoan from the Nama Group. Scien
 ce 296: 2383-2386.\n\nZHURAVLEV\, A. Yu and WOOD\, R.A. 2008. Eve of biomi
 neralization: controls on carbonate mineralogy. Geology 36: 923-926.\n\nWO
 OD\, R. 2011. Paleoecology of early skeletal metazoans: insights into biom
 ineralization. Earth-Science Reviews 106\, 184-190. 
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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