Transcript Early Earth - Hopkinton School District

Early Earth
Emily Calder
Madeline Cudmore
Rebecca Shatney
Hadean Era
 10 billion years after formation of the
universe.
 Earth forms from gas and dust.
 Meteors 500 million years
uninhabitable.
 Hot.
 Mass increase temp decrease.
 Early atmosphere-CO2, water vapor,
nitrogen, methane, ammonia.
 Little or no oxygen.
 UV rays.
 Meteor collisions decrease temp
decrease.
 Surface hardens.
 Water vapor -> rain ->oceans.
Beginning of life
 3.85 million years ago.
 Greenland.
 Need organic chemicals.
 RNA.
 Underwater geothermal
vents.
Chronometric Defining
 According to events.
 Natural disasters,
discoveries, dating, life…
 Even period divisions.
 Random durations.
 Neoproterozoic
 Ediacaran-630
 Cryogenian-850
 Tonian-1000
 Mesoproterozoic
 Stenian-1200
 Ectasian-1400
 Calymmian-1600
 *Million Years Ago
Mesoarchean
 3.2- 2.8 billion years
ago.
 Defined chronometrically.
 One of the first
supercontinent Vaalbara
broke during this time.
 Life forms have not
changed much.
Neorarchean
 2.8 – 2.5 billion years ago.
 Also defined
chronometrically.
 Oxygen photosynthesis
first evolved (caused the
oxyen catastrophe, which
was in the paleoproterzoic
era).
 The supercontinent
Kenorland was formed
around 2.7 billion years
ago.
 Life forms have not
changed much.
Paleoprotoerzoic Era

Statherian, Orosirian, Rhyacian, Siderian.

2.5 to 1.6 billion years ago.

Continents first stabilized.

Ur

Arctica

Atlantica

Nena

Columbia

Anaerobic life.

Life using oxygen and photosynthesis
appeared.

Oxygen Catastrophe.

Fossil evidence of the first eukaryotes.

Paleontological evidence-1.8 billion years
ago- 450 days a year and 20 hours a
day.
Mesoproterozoic Era
 Stenian, Ectasian, Calymmian.
 1.6 to 1.0 billion year ago.
 Supercontinent Rodinia.
 Great floodplain.
 Sexually reproducing life
appears.
 Multi-cellular animals.
 Oxygen levels rise
significantly.

No big natural disasters or
events.
 Continent pieces expand,
causing the ocean to shallow.
Neoproterozoic Era

Ediacaran, Cryogenian, Tonian.

1.0 billion to 542 million years ago.

Rapid melting of all ice caps on the
world.

Breakup of Rodinia.

Formation of Pannotia.

Rise in carbon dioxide leads to mini ice
age. “Snow Ball Earth”.

Rise of soft-bodied multicellular
organisms.

Diseases appear.

Corals, sea anemones, hydras, jellyfish,
simple metazoa.

Not organs

Just a body cavity or stomach

Mouth, usually surrounded by
tentacles.
 http://www.youtube.com/watch?v=hSdlQ8x7cukhttp://
www.youtube.com/watch?v=hSdlQ8x7cuk
Citations

http://www.mahjoob.com/en/forums/showthread.php?t=275459

http://lena-panthera.deviantart.com/art/Carte-de-Vaalbara-map-173079888

http://www.geol.umd.edu/~tholtz/G102/102arch2.htm

http://en.wikipedia.org/wiki/Neoarchean

http://en.wikipedia.org/wiki/Mesoarchean

http://bio1152.nicerweb.com/Locked/media/ch25/clock.html

http://astroclock2010.files.wordpress.com/2010/05/hadean_earth_space_art.jpg

http://www.sciencephoto.com/image/134450/530wm/C0071453-Formation_of_the_Earth,_artwork-SPL.jpg

http://www.fossilmuseum.net/Paleobiology/Images/cyanobacteria.jpg

http://science.nationalgeographic.com/science/prehistoric-world/precambrian

http://en.wikipedia.org/wiki/Paleoproterozoic

http://essayweb.net/geology/timeline/paleoproterozoic.shtml

http://palaeos.com/proterozoic/proterozoic.htm

http://essayweb.net/geology/timeline/mesoproterozoic.shtml

http://www.pbs.org/wgbh/evolution/change/deeptime/precam.html