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(ocean and ecosystem collapse, mass extinction, volcanic activity…
ocean and ecosystem collapse
oxygen levels dropped
sulfur bacteria spread in oceans
marine food chains collapsed
greenhouse gases increased
global temperatures rose about 5°C
methane escaped from ocean floor
mass extinction
ecosystems collapsed
only a few species survived
some evolved into animals alive today
around 95% of sea life died
many land species disappeared
volcanic activity (Siberian Traps)
ash filled atmosphere
sulfur dioxide blocked sunlight
temporary blocked sunlight andcooling happened
carbon dioxide released
temperature increased
global warming intensified
sedimentary layers
show scientists what happened over time
red rocks show dry environments
greenish layers show wetter environments