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? 3. What kind of life appeared in the Cambrian?

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)

Paleozoic Era - Ordovician Period 488-444 mya diversification of marine organisms evolution of plants onto land. The Ordovician ended with a mass extinction. Development of coral reefs

Paleozoic Era Silurian Period 444-416 mya The start of significant life on dry land First Vascular Plants Sea Scorpions

Sea Scorpions

Paleozoic Era Devonian Period 416-359 mya “Age of the Fishes” Examples, placoderms, lobefin fish, cartilaginous fish, and bony fish First true trees Late Devonian extinction

Paleozoic Era Carboniferous Period 359-299mya “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

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

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

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.