Mass Extinction

Question 1

ODPTC

Answer 1

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Ordovician 450
Devonian 364
Permian 250
Triassic 200
Cretaceous 65 mya

Question 2

Ordovician

Answer 2

450 mya
1. over 60% of marine invertebrates
2. corals, bivales
3. continental drift, drop in sea levels, glaciation, more salidity in sea, more salt than water

Question 3

Devonian

Answer 3

364 mya
1. series over 25 my
2. 50% of all genera mostly marine
3. agnathan, placoderm fish
4. anoxia lowers sea levels

Question 4

Permian

Answer 4

250 mya
1. 50% of all terrestrial families
2. 70% of terrestrial, 90% marine extinct
3. trilobites gone
4. echrioderms badly affected

Question 5

Triassic

Answer 5

200 mya
1. 50% of all genera
2. conodonts gone
3. amphibians badly affected

Question 6

Cretaceous

Answer 6

65 mya
1. 75% of all species
2. ammonites, belemites, dinosaurs (except birds) gone

Question 7

volcanic cause

Answer 7

1. siberian traps had basalt lava, size of 1.6 million square km of eastern Russia
2. depth of 400-3000m
3. released over 600,000 years
4. global warming, frozen gas, methane, greenhouse effect

Question 8

results of permian

Answer 8

1. opened niche space for new species
2. broke up shore line for new continent
3. dinosaurs could take over

Question 9

asteroid

Answer 9

1. vaporisation of anhydrite and seawater make sulfur dioxide
2. so2 plus water make sulfuric acid
3. force of the asteroid caused earthquakes (chicxulub)