EESA06H3 Lecture Notes - Lecture 6: Anomalocaris, Solar Wind, Stromatolite
11 Jan 2016
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Step 1: the earliest bacteria: 3. 8 ga(?) Step 2: the cambrian explosion: 542 ma (multicellular animals with shells, Step 3: diversification during the paleozoic: c. 400-250 ma. Hadean period hell on earth - rocks was molten, no water no atmosphere. Diversification heavier elements sank to the middle. Magnetic field to hold on to the gases which build up atmosphere + oceans. Shells buried and preserved unaltered (<100 million years) Mineralization - cavities are filled with silica, calcium carbonate, iron (ex: tree. Most fossils are found in sedimentary rock: exception: pompeii people covered by pyroclastic flow and fossilized in stumps) ash. Sedimentation (fine grained =more detail, chemical makeup of rock = color) More sediments pile on = pressure rock. Mineral rich water = changes to the shell. Uplift by continental crusts coming together. Ammonite fossils iridescent aragonite with trace elements (plate tectonics) (fe, mn, al, ba) Palaeocology study of ancient organisms and their environments.
