Paleozoic Era 570,000,000 yrs ago to 225,000,000 yrs ago Life starts in the seas and moves onto land Six periods: Cambrian Ordovician Silurian Devonian.

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Presentation transcript:

Paleozoic Era 570,000,000 yrs ago to 225,000,000 yrs ago Life starts in the seas and moves onto land Six periods: Cambrian Ordovician Silurian Devonian Carboniferous Permian

Paleozoic Era Cambrian Period ( MYA)  Cambrian Explosion – Most major animal phyla are found in the fossil record (mostly aquatic invertebrates with exoskeletons).  Burgess Shale – major fossil site located in Canadian Rockies

Paleozoic Era Ordovician Period ( MYA) 1 st vertebrates (in ocean) - jawless fish (filter feeders) The lamprey of today is a parasite.The hagfish is a scavenger.

Creatures of the Ordovician Period

Paleozoic Era Silurian Period ( MYA)  Ozone (O 3 ) layer formed which blocks harmful UV radiation; life could evolve on land.  1 st land plants (mosses & ferns) followed by 1 st land animals (invertebrates like spiders & scorpions).  1 st jawed fish (later evolved into sharks-made of cartilage).

Paleozoic Era Devonian Period ( MYA)  1 st vertebrates on land – amphibians Evolved from the lobed-fin fish which include the lungfish.

Paleozoic Era Devonian Period ( MYA)  “Age of the Fish” (giant armored fish).  1 st bony fish (scales and swim bladder for buoyancy).

View of Earth—Devonian Period

Life of the Devonian Period

Paleozoic Era Carboniferous Period ( MYA)  1st reptiles  North America has a tropical climate creating coal deposits of today  Amphibians & insects dominate and become large (dragon flies-1m wing span; cockroaches-10 cm long).

View of Earth—Carboniferous Pd

Paleozoic Era Permian Period ( MYA) Early Permian reptiles, Cacops in front & Casea in back. The middle Permian reptile, Anteosaurus.  Reptiles dominate.  Pangaea begins to form (dry climate)  Mass Extinction (90% of all marine invertebrates go extinct & 70% of all land species go extinct).

View of Earth—Permian Period

FIVE Mass Extinction