Chapters - Extrinctions
9 important questions on Chapters - Extrinctions
How many major mass extinctions have their been in the history of the Earth?
What are the characteristics of the first m.e.e.?
- 440 million years ago
- life was concentrated in the seas and dominated by benthic marine organisms
- wiped out more than 100 families of marine life, including approximately half of all genera
- Ordivician–Silurian event
What are the characteristics of the second m.e.e.?
- 365 million years ago
- Land plants had begun to evolve at this time, and sharks and bony fishes appeared in the oceans
- Extinctions were focused on marine organisms, particularly reef-building corals and other marine invertebrates
- end-Devonian event
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What are the characteristics of the third m.e.e.?
- 250 million years ago
- wiping out 90% of all species
- first to hit land species with major losses—more than half of all land species, mostly plants, were lost
- Permian–Triassic or end-Permian extinction
What are the characteristics of the fourth me.e.?
- 200 million years ago
- affecting large terrestrial animals as well as plants and marine species
- the end-Triassic event paved the way for the evolution of the dinosaurs by wiping out many large animals, mostly amphibians
What are the characteristics of the fifth m.e.e.?
- 65 million years ago
- dramatic in its abruptness and the thoroughness with which it eliminated all dinosaurs from the face of the planet
- only the clade that evolved into modern birds would survive
- Cretaceous–Tertiary boundary (abbreviated K–T following European spelling)
Where climate change is a contributing cause?
What are the characteristics of PETM?
Why are the interglacial periods not accompanied by extinctions events?
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