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Lecture 6

Lecture 6 In Class Notes

3 Pages
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Department
Environmental Science
Course Code
EESA06H3
Professor
Nick Eyles

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Lecture 6
Hadean was the first time on earth, nicknamed hell on earth, beacuase the rocks were
molten, no ocean, no atmosphere
But then the world differentiated, heavy elements sank down becoming the core, mantle,
crust, etc. This also allowed a magnetic field to be developed, which created the conditions
to build an atmosphere by constricting the gases and oceans
Four major steps to life on earth
1.The earliest bacteria 3.8 Ga
2.The Cambrian explosion 542 Ma (multicellular organisms with shells, backbones, etc.)
3.Diversification during the Paleozoic c.400-240Ma
4.Role of meteorites
A fossil is formed by any cavities filled in with silica, calcium carbonate, iron a process
called mineralization
Permineralization is the process that forms fossils:
1.Organism dies in or near water
2.Soft parts consumed by bacteria
3.Sedimentation (fine grained = more detail, chemical makeup of rock = colour)
4.More sediments pile on = pressure = rock (lithification)
5.Mineral rich water = changes to the shell
6.Uplift
7.Erosion
Ammonite fossils: have identical halves; iridescent aragonite with trace elements (Fe,
Mn, Al, Ba)
Ammonilite: an organic gemstone
Trace fossils are preserved tracks, trails, burrows, borings
Ichnology: study of trace fossils
Bioturbation : process of sediment
Palaeoecology: study of ancient organisms and their environment
Clues of the ancient environments can be from: Fossil types, assemblages (groups of fossils
usually found together), fossil morphology (shape), trace fossils
Stratigraphy: to establish age of rock units, correlate units
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Description
Lecture 6 Hadean was the first time on earth, nicknamed hell on earth, beacuase the rocks were molten, no ocean, no atmosphere But then the world differentiated, heavy elements sank down becoming the core, mantle, crust, etc. This also allowed a magnetic field to be developed, which created the conditions to build an atmosphere by constricting the gases and oceans Four major steps to life on earth 1. The earliest bacteria 3.8 Ga 2. The Cambrian explosion 542 Ma (multicellular organisms with shells, backbones, etc.) 3. Diversification during the Paleozoic c.400-240Ma 4. Role of meteorites A fossil is formed by any cavities filled in with silica, calcium carbonate, iron a process called mineralization Permineralization is the process that forms fossils: 1. Organism dies in or near water 2.
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