Precambrian Time 4,600,000,000 yrs ago to 570,000,000 yrs ago

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Presentation transcript:

Precambrian Time 4,600,000,000 yrs ago to 570,000,000 yrs ago 85% of Earth’s History!! Simple Life starts in the oceans

The center of Earth was melted by great pressure and intense heat. Oldest rock found in Western Australia An atmosphere formed as Earth cooled. primitive atmosphere forms from volcanic eruptions Did NOT contain oxygen gas Oceans form from water vapor released in eruptions & maybe comets 4.1BYA The surface of Earth cooled forming the crust The Earth Forms 6 BYA The Solar system formed from swirling gases and dust 4.5BYA Rocks in the solar system condensed to form Earth

4.6 BYA Precambrian Time 4.3 BYA Precambrian Time A molten Earth forms Surface cools, forming the crust Oldest rock found in Australia & Canada primitive atmosphere forms from volcanic eruptions (No Free oxygen gas). Oceans form (from water vapor released in eruptions & comets)

Comparison of Atmospheres

Hydrothermal Ocean Vents Where did Life Start? Hydrothermal Ocean Vents nutrient rich, possibly with complex molecules which may have joined together to form structures such as cells Ocean covered in Ice extra protection from UV radiation and opportunity for organization Meteorites or Comets rich with building blocks of life

3.5 BYA Precambrian Time Oldest fossils of bacteria (prokaryotes). Simple and small Lack a nucleus Do not need oxygen to survive

Miller/Urey Experiment (1953) Tried to create life from a simulated primitive atmosphere. Instead created complex molecules, but no cells.

3.0 BYA Precambrian Time Cyanobacteria (blue-green algae) evolve creates energy from photosynthesis gives off oxygen gas (beginning to form the atmosphere of today) Form large stromatolites (below)

1.5 BYA Precambrian Time Eukaryotes contain a nucleus more complex, larger, single celled organisms Evolved from prokaryotes

630 MYA Precambrian Time Multicellular organisms evolve with soft bodies Species include: jelly fish; coral stalks; segmented worms; algae