Falcon Focus 1. A cowboy rides into town on Friday. He stays two days, then leaves Saturday. How can this be? 2.

570 million years ago to 245 million years ago 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

Paleozoic Era

Earth in Early Paleozoic Time

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The Paleozoic Era began with.. early invertebrates 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

Then came Arachnids and Insects Paleozoic Era Early Vertebrate Fish Jawless fish Vertebrate = has backbone Then came Arachnids and Insects

Paleozoic Era 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 Paleozoic Era 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)