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Life Effects End Cretaceous Mass Extinction (Impact Effects on Life (Ocean…
Life Effects End Cretaceous Mass Extinction
Impact Effects on Life
Sudden extinctions
coincide w iridium spike
mass kill Cretaceous plankton
dinosaurs disappear
Negative excursion C isotope
ecosystem instability
Ocean Disequilib for ~10kyr
Low diversity
Strange plankton develop
Collapse of ocean food chain
End of Mesozoic Oceans
Most Forams Extinct
Sone 'disaster species' radiate
blooms & adaptive radiation
after asteroid impact
Ecological Cascade
Planktic extinction
propagating effect through food chain
i.e. marine reptiles & ammonites extinct
Timescales
Events = sudden, shortlived
Weeks to hundreds yrs max - not kyr
Recovery = faster than Permian
(discrete impact event)
Sudden Extinction
Ocean Changes
Cretaceous
plankton diverse & abundant
Iridium Layer
sudden mass kill most plankton
Strangelove Ocean
for ~10 kyr after impact
most plankton dead
weird plankton trying to evolve & stabilise
New plankton species appear
Rapid recovery - Stability within 10 kyr -
new norm established
Terrestrial Change
Dinosaurs disappear