Overview of natural history Breakdown of time Different periods of Earth’s history are broken into...
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![Page 1: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/1.jpg)
Overview of natural history
![Page 2: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/2.jpg)
Breakdown of time
• Different periods of Earth’s history are broken into sets of time
– just like a year is broken into months, weeks, days and hours
• Earth history is broken into eons, eras, periods, epochs
![Page 3: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/3.jpg)
Eons – Millions and Billions of years • Haden: Earth before life evolved
4.6 to 3.5 Billion years ago (13% of Earth’s history) • Achaean: Earth with only bacteria like cells
3.5 to 2.5 Billion years ago (28% of Earth’s history) • Proterozoic: Multicellular life forms
2.5 BYA to 540 MYA (48% of Earth’s history)
• Phanerozoic: Dinosaurs to now• 540 MYA – present day
(11% of Earth’s history)
![Page 4: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/4.jpg)
How time periods are distinguished
• Major geological events: The movement of tectonic plates to form continents & super-continents
• Changes in climate: a change from an ice ace to a warming period
• Mass extinctions or explosions: Changes in the types of life forms on earth
![Page 5: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/5.jpg)
Haden Eon 4.6-3.5 BYA• So hot that the rock was molten &
Water was vapor
• Lifeless, little O2 in the atmosphere
• Relative to a calendar year:
• Jan 1st – Feb. 25th
![Page 6: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/6.jpg)
Achaean Eon 3.5-2.5 BYA
• Earth cooled enough to have a crust & ocean
• Life forms in the sea• Bacteria & photosynthetic blue-green algae
Feb. 25th - April 17th
![Page 7: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/7.jpg)
Proterozoic Eon: Precambrian Era2.5 BYA – 540 MYA
• Super continent Rodinia
• 21% O2 in Atmosphere
• First complex cell -July 13th
• First multicellular organism (seaweed/algae)– Aug 31st
![Page 8: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/8.jpg)
Haden
lifeless Earth
Achaean Achaean
Prokaryotic lifeProkaryotic life
Little OLittle O22
Review of Earth’s first 3.9 Billion years
Proterozoic
Eukaryotic life, multicellular plants, First plants & soft bodied animals in oceans later vascular
plants fish, arthropods in ocean
Insects, amphibians & reptiles on land
![Page 9: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/9.jpg)
Paleozoic Era From the Cambrian explosion to the
dawn of the dinosaurs
![Page 10: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/10.jpg)
Cambrian - Permian period:540 MYA – 248 MYA
• Cambrian: Starts with a burst of new life forms & all life in ocean
• Plants & animals evolved from simple seaweed & sponges
• to fish in the oceans & insects, amphibians, and early reptiles on land
• 1 Mass extinction in the ocean • Nov. 17 – Dec 6
![Page 11: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/11.jpg)
Triassic period to Holocene Epoch 248 MYA – present
• From the early dinosaurs to extinction 65 MYA
• 1st mammals, birds, and flowering plants
• The ice age to modern civilization
• Dec 7th - Midnight Dec 31st
![Page 12: Overview of natural history Breakdown of time Different periods of Earth’s history are broken into sets of time –just like a year is broken into months,](https://reader035.fdocuments.in/reader035/viewer/2022062423/56649ee95503460f94bfae27/html5/thumbnails/12.jpg)
Review of last 248 Million years
First Dinosaurs
Last Dinosaurs
Flowering Plants
First Mammals
First bird
First monkeyFirst human
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Review
1. What was the surface of the earth like during the Haden Era?
2. During which era did multicellular life evolve?3. Which is a shorter period of time and eon or an era? 4. Which came first birds or mammals?