Transcript Paleozoic Era

Falcon Focus
1. A cowboy rides into town on Friday.
He stays two days, then leaves
Saturday. How can this be?
2.
Paleozoic Era
Life starts in the seas and moves onto land
570 million years ago to 245 million years ago
Six periods:
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Earth in Early Paleozoic
Time
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Cambrian Explosion =
Explosion of life
 The Paleozoic Era began with.. early invertebrates
 Trilobites, Brachiopods
Mostly aquatic invertebrates with exoskeletons = water-dwelling
organisms without backbones and hard shells.
 How do we know? Found in the fossil record
Early Vertebrate Fish
Jawless fish
Vertebrate = has backbone
Then came Arachnids and Insects
First Amphibians
**First vertebrates on LAND
First Land Plants
Ferns, mosses, cone-bearing plants
By the END of the Paleozoic Era…
Seed plants were common
Reptiles became DOMINANT
MASS EXTINCTION EVENT
Killed off most marine (underwater) invertebrates
and amphibians
*Made way for the … DINOSAURS
Earth in Early Paleozoic
Time
View of Earth—Devonian
Period (410 MA)
View of Earth—Permian
Period (260 MA)