Geologic time
Chapter 13
Evolution and Geologic Time
Section 13.1
What are the units of geologic time?
What are the units of geologic time?
Era
Period
epoch
Give the Eras of Geologic time.
Give the Eras of Geologic time.
Precambrian
Paleozoic ancient life
Mesozoic middle life
Cenozoic recent life
Organic Evolution
Organic evolution change in life-forms through time
Species group of organisms that normally reproduce only among themselves
Natural selection process by which organisms with traits that are suited to a certain environment have
a better chance of surviving and reproducing than organisms whose traits are not suited to it.
Present-Day Rapid Extinctions
Section 13.2
How do humans promote extinctions?
Kill organism faster than they can reproduce
Over hunting
Carelessness
Change environment destroy habitat
Early Earth History
Section 13.3
What was the dominant life forms in Precambrian time?
Cyanobacteria blue green bacteria that produced oxygen on earth
Name the Periods of the Paleozoic Era.
Cambrian trilobites, brachiopods
Ordovician first land plants
Silurian warm, shallow seas
Devonian fish dominant, first amphibians
Mississippian amphibians dominant
Pennsylvanian reptiles and insects evolve
Permian mass extinction
Middle and Recent Earth History
Section 13.4
Name the Periods of the Mesozoic Era
Triassic first mammals, Pangaea breaks up
Jurassic Dinosaurs dominant, first birds
Cretaceous angiosperms appear
Name the Periods and Epochs of the Cenozoic Era.
Tertiary
Paleocene
Eocene
Oligocene
Miocene
Pliocene mammals abundant
Quaternary
Pleistocene
Holocene Homo sapians evolves
