Flashcards in L9 - Explosions and Extinctions Deck (10):
When did Stromalites emerge again? What impact did they have?
3.3 mya - Cyanobacteria who used oxygenic photosynthesis
What benefits does oxygen in the atmosphere have?
Ozone layer - protection from UV radiation
Enables aerobic respiration
When did Rodinia split up?
750 mya - Late pre-Cambrian
What might more landmass in Northern latitudes have done to Earth's climate?
Caused glaciation - Snowball Earth hypothesis
Over what period did trilobites live?
- >20,000 species in 5,000 genera
What are the principal animal taxonomic ranks?
Kingdom, Phylum, Class, Order, Family, Genus, Species
Kinky pals can offer friends great sex
What are Lagerstatten?
Deposits with many fossils with exceptional preservation
- Concentration Lagersatten - Quantity fossils
- Conservation Lagersatten - Quality fossils
Name two Cambrian Lagerstatten
- 525 mya - Early Cambrian
- Shallow sea
Burgess Shale, Canada
- Discovered by Charles Dolittle Walcott in 1901
- 505 mya - Late Cambrian
- Disturbed by turbidite flows
Tell me the story of Hallucigenia
Initially thought to be odd stilt walking thing
Now thought to be more slik-worm like