L9 - Explosions and Extinctions Flashcards Preview

The Natural World > L9 - Explosions and Extinctions > Flashcards

Flashcards in L9 - Explosions and Extinctions Deck (10):
1

When did Stromalites emerge again? What impact did they have?

3.3 mya - Cyanobacteria who used oxygenic photosynthesis

2

What benefits does oxygen in the atmosphere have?

Ozone layer - protection from UV radiation
Enables aerobic respiration

3

When did Rodinia split up?

750 mya - Late pre-Cambrian

4

What might more landmass in Northern latitudes have done to Earth's climate?

Caused glaciation - Snowball Earth hypothesis

5

Over what period did trilobites live?

542-252 mya
- >20,000 species in 5,000 genera

6

What are the principal animal taxonomic ranks?

Kingdom, Phylum, Class, Order, Family, Genus, Species

Kinky pals can offer friends great sex

7

What are Lagerstatten?

Deposits with many fossils with exceptional preservation
- Concentration Lagersatten - Quantity fossils
- Conservation Lagersatten - Quality fossils

8

Name two Cambrian Lagerstatten

Chengjiang, China
- Shale
- 525 mya - Early Cambrian
- Shallow sea
Burgess Shale, Canada
- Discovered by Charles Dolittle Walcott in 1901
- 505 mya - Late Cambrian
- Disturbed by turbidite flows

9

Tell me the story of Hallucigenia

Initially thought to be odd stilt walking thing
Now thought to be more slik-worm like

10

How long did the Cambrian explosion last?

80 myr