Paleozoic Era Life starts in the seas and

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Paleozoic Era Life starts in the seas and moves onto land 570, 000 years

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

Cambrian Period (570 -500 MYA) p Cambrian Explosion – Most major animal phyla are

Cambrian Period (570 -500 MYA) p Cambrian Explosion – Most major animal phyla are found in the fossil record (mostly aquatic invertebrates with exoskeletons). p Burgess Shale – major fossil site located in Canadian Rockies

Ordovician Period (500 -435 MYA) 1 st vertebrates - jawless fish (filter feeders) p

Ordovician Period (500 -435 MYA) 1 st vertebrates - jawless fish (filter feeders) p The vertebrate protects the spinal cord, which carries signals from the brain throughout the body. The lamprey of today is a parasite. The hagfish is a scavenger.

Silurian Period (435 -395 MYA) p 1 st jawed fish (later evolved into sharks-made

Silurian Period (435 -395 MYA) p 1 st jawed fish (later evolved into sharks-made of cartilage). p Ozone (O 3) layer formed which blocks harmful UV radiation; life could evolve on land. p 1 st land plants (mosses & ferns) followed by 1 st land animals (arthropods-spiders & scorpions).

Devonian Period (395 -345 MYA) p “Age of the Fish” (giant armored fish). p

Devonian Period (395 -345 MYA) p “Age of the Fish” (giant armored fish). p 1 st bony fish (scales and swim bladder for buoyancy).

Devonian Period p (395 -345 MYA) 1 st vertebrates on land – amphibians n

Devonian Period p (395 -345 MYA) 1 st vertebrates on land – amphibians n Evolved from the lobed-fin fish which include some species of lungfish.

Carboniferous Period p p North America is at the equator (tropical swamps form coal

Carboniferous Period p p North America is at the equator (tropical swamps form coal deposits) Amphibians & insects dominate and become large n p (345 -280 MYA) (dragon flies-1 m wing span; cockroaches-10 cm long). 1 st reptiles

Permian Period p p p (280 -225 MYA) Reptiles dominate. Pangaea begins to form

Permian Period p p p (280 -225 MYA) Reptiles dominate. Pangaea begins to form (Appalachian Mnts; dry climate; ice age in the southern hemisphere) Mass Extinction (90% of all species go extinct-mostly marine invertebrates). Early Permian reptiles, Cacops in front & Casea in back. The middle Permian reptile, Anteosaurus.

Mass Extinction One of the Big FIVE Mass Extinctions

Mass Extinction One of the Big FIVE Mass Extinctions