paleozoic era
DESCRIPTION
Life starts in the seas and moves onto land. Paleozoic Era. Six periods : Cambrian Ordovician Silurian Devonian Carboniferous Permian. 570,000,000 years ago to 225,000,000 years ago. Cambrian Period (570-500 MYA). - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/1.jpg)
Paleozoic EraPaleozoic Era
570,000,000 years ago to 225,000,000 years ago570,000,000 years ago to 225,000,000 years ago
Life starts in the seas and moves onto land
Six periods:CambrianOrdovician
SilurianDevonian
CarboniferousPermian
![Page 2: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/2.jpg)
![Page 3: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/3.jpg)
Cambrian Period (570-500 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
![Page 4: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/4.jpg)
![Page 5: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/5.jpg)
Ordovician Period (500-435 MYA)
1st vertebrates - jawless fish (filter feeders) 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.
![Page 6: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/6.jpg)
![Page 7: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/7.jpg)
Silurian Period (435-395 MYA)
1st jawed fish (later evolved into sharks-made of cartilage).
Ozone (O3) layer formed which blocks harmful UV radiation; life could evolve on land.
1st land plants (mosses & ferns) followed by 1st land animals (arthropods-spiders & scorpions).
![Page 8: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/8.jpg)
![Page 9: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/9.jpg)
Devonian Period (395-345 MYA)
“Age of the Fish” (giant armored fish).
1st bony fish (scales and swim bladder for buoyancy).
![Page 10: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/10.jpg)
Devonian Period (395-345 MYA)
1st vertebrates on land – amphibians Evolved from the lobed-fin fish which include some
species of lungfish.
![Page 11: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/11.jpg)
![Page 12: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/12.jpg)
Carboniferous Period (345-280
MYA)
North America is at the equator (tropical swamps form coal deposits)
Amphibians & insects dominate and become large (dragon flies-1m wing span; cockroaches-10 cm long).
1st reptiles
![Page 13: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/13.jpg)
![Page 14: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/14.jpg)
Permian Period (280-225 MYA)
Early Permian reptiles, Cacops in front & Casea in back.
The middle Permian reptile, Anteosaurus.
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).
![Page 15: Paleozoic Era](https://reader036.vdocuments.site/reader036/viewer/2022081419/568139d9550346895da18bc0/html5/thumbnails/15.jpg)
Mass Extinction
One of the Big FIVE Mass Extinctions