Warm-up Week 171. _____ was the major source of free

oxygen in the atmosphere.

a. molten rock c. green plants

b. water d. silicate minerals

1. Changing _____________ was the cause of the Paleozoic extinction.

2. A giant __________ was most likely the cause of the great Mesozoic extinction.

Cenozoic Era: Age of Mammals(65 MYA Now.)

13.4

“RECENT LIFE.”

Cenozoic: Less Time Ago…

1. Better Fossils!

2. “Richer”

History.

Cenozoic Land:• Lots of Plate

Movement

• New:– Mountains

– Volcanoes

– Earthquakes

Cenozoic Life:• Plants:

–Angiosperms

–Flowers!

• Post-Dino

• Mammals–Humans!

Why Mammals kick-butt…

1. Born alive

2. Warm-blooded– Maintain body tempo

3. Hair

Beat-out Reptiles!

Rhinoceros.

Indricotherium• 20 ft tall• 25 ft long• 30 tons

Late Cenozoic Mammal Extinction• Largest die• Why?

- Humans…

Hunting Season?...

Relative Dating Review.