1. TIMELINE LAB
Week of October 7th, 2013

2. Do-Now 9/30/14
Put these events in the order you think they occurred (from earliest to latest). Next to each event, write how long ago you think the event took place.
First dinosaurs
Most recent ice age
First hominids
First life (bacteria)
First modern humans
First oxygen in atmosphere
First land plants

3. Correct order First life (bacteria) 3,500 million years ago
First oxygen in atmosphere 2,400 million years ago
First land plants 430 million years ago
First dinosaurs 250 million years ago
First hominids .035 million years ago
First modern humans 6.5 million years ago
Most recent ice age .025 million years ago

4. Geological Event vs. Biological Event?
First dinosaurs
Most recent ice age
First hominids
First life (bacteria)
First modern humans
First oxygen in atmosphere
First land plants

5. How old is earth?
About 4,600 million years old = 4.6 billion years ago

6. Timeline Lab Instructions
Use poster paper provided to make a geologic time line. Distance will represent time.
Scale:
2 meters = 5 billion years
100 million years = .04 meters (4cm)
You will begin by drawing a line 2 meters long, and marking every 4cm.
Start with Today (0 million years ago (mya)) and end with Earth’s formation (4.6 billion years ago or 4600 mya.
Add the events that are starred (*) on your timeline
Note: Use different colors to write geological and biological events

7. Events to include on timeline:
Modern humans
Neanderthals
Lucy
Hominids
Primates
Flowering Plants
Mammals
Dinosaurs
Reptiles
Amphibians
Land plants
Multicellular organisms (algae)
Eukaryotes
Life (bacteria—Prokaryotes)
Most recent ice age
Separation of Antarctica and Australia
Tertiary Meteor Impact
Breakup of Pangaea and formation of the Atlantic Ocean
Formation of Pangaea
Free oxygen nears present levels (21%)
Free oxygen building in the atmosphere (0.2%)
Formation of Earth

8. Analysis questions
1. What does the timeline model help you see about geologic time? Is 100 million years a long time in terms of Earth’s history?
2. Certain geological events precede biological events. Give an example and explain why the geological event had to come before the biological event.
3. What is the relationship between plant and animal events on the timeline?