1. Materials: Pencil Notebook Notes highlighter Bell work
1-9
Materials:
Pencil
Notebook
Notes
highlighter
Bell work
DO: Today we will continue learning about the history of Earth.
DQ: You may use your notes to answer the following questions:
1. What is the first eon of earth’s history called?
What kind of life appeared in the Precambrian?
What kind of life appeared in the Cambrian?

2. Answers What is the first eon of earth’s history called?
Precambrian - Hadean
What kind of life appeared in the Precambrian?
Unicellular algae and bacteria formed and then multicellular organisms formed towards the end.
What kind of life appeared in the Cambrian?
An explosion of multicelluar life including marine animals and plants ( Ex: Trilobites, anomalocaridids)

3. Paleozoic Era - Ordovician Period
mya
diversification of marine organisms
evolution of plants onto land.
The Ordovician ended with a mass extinction.
Development of coral reefs

5. Paleozoic Era Silurian Period
mya
The start of significant life on dry land
First Vascular Plants
Sea Scorpions

7. Sea Scorpions

8. Paleozoic Era Devonian Period
mya
“Age of the Fishes”
Examples, placoderms, lobefin fish, cartilaginous fish, and bony fish
First true trees
Late Devonian extinction

10. Paleozoic Era Carboniferous Period
mya
“Coal Age,” very well known for plant fossils that make up the world’s major coal seams
“Age of the Amphibians,” including ancestors of modern terrestrial vertebrates
Evolution of amniotic egg in reptiles

14. Amphibian eggs
Newly discovered “legless” amphibian- produces eggs that have yolk

15. Paleozoic Era Permian Period 299-252 mya
Great diversity of amphibians and early reptiles
Therapsids were common (mammal-like reptiles)
Greatest diversity of insects of all time
Seed plants became more dominant
The period ends with the largest mass extinction in the past 600 million years

18. Act 90 – Figuring out fossils
Observe 3 fossils with your partner – trade and observe the other 3 – for a total of 6 fossils
Write observations & a description of each fossil
Use the provided sheet to find out some information about the fossil. Use your computer to research additional facts about each fossil.