powerpoint for des
TRANSCRIPT
![Page 1: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/1.jpg)
Well, here’s the periods!
![Page 2: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/2.jpg)
Cambrian Period
543-490 mya
Cambrian explosion!
![Page 3: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/3.jpg)
Ordovician Period490-443 mya
Extinction (60% of invertabrates extinct due to climate change)
Beginning and middle end
Marine invertebrates trilobites & brachiopods
![Page 4: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/4.jpg)
Silurian Period
443-417 mya
Ancestors of spiders and centipedes
Stable climateGlaciers meltedOcean levels went up
Vascular plants
Coral reef
![Page 5: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/5.jpg)
Devonian Period417-354 mya
Tetrapods! Seed plants like gymnosperms
North=drySouth =cool, temperate, ocean-covered
Age of fishes! Increase of terrestrial animals
![Page 6: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/6.jpg)
Carboniferous Period
354-290 mya
Large plants and trees
Forest swamps covered land!
amphibians
Reptiles - Amniotic egg was covered with a leathery/hard shell
![Page 7: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/7.jpg)
Permian
290-248 myaamphibians
prevalent More prevalent
MASS EXTINCTION DRY!Great seasonal fluctuations
Pangaea formed & it was
Gymnosperms replaced ferns
![Page 8: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/8.jpg)
triassic
248-206 mya
Gymnosperms still dominant plant
TRUE MAMMALS
LOTS OF REPTILES!
![Page 9: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/9.jpg)
jurassic
Gymnosperm still plentiful
Early bird-like creatures/archaeopteryxReptiles continued to be dominant including dinos
206-144 mya
![Page 10: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/10.jpg)
cretaceous
3rd MASS EXTINCTION
144-65 mya
![Page 11: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/11.jpg)
tertiary 65-1.8 mya
Mammals diversify
Angiosperm =dominant land plant
![Page 12: Powerpoint for des](https://reader035.vdocuments.us/reader035/viewer/2022062513/55508c5ab4c905a85c8b4e1d/html5/thumbnails/12.jpg)
quaternary
1.8 mya - now
Hominids become more like humans