Paleozoic Era Life starts in the seas and
- Slides: 15
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 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 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 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 1 st bony fish (scales and swim bladder for buoyancy).
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 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 (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
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