Lecture 6 - Bitter Springs formation = rock Early Earth had...

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Autotrophic process – sunlight and chemicals to generate energy Apex Chert - Rock horizon rich in silica Photosynthesis – not replicable, not smart enough to do so; is very complex Early life( not fossils) – rocks discovered were rich in carbon 12 enrichment in carbon 12 = life in action/ photosynthesis Stromatolites (plants) Mats of cyanobacteria (algae) keeps crawling up when covered by sediments because they photosynthesize, they do not want to be covered More continentals = more shallow water = more likely for these stromatolites to exist Boring for the most of history of life on Earth because of the low diversity of prokaryotes, they only clone themselves. Now we are able to mix our genetics, diverse.
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Unformatted text preview: Bitter Springs formation = rock Early Earth had barely any oxygen and it developed thru time Light weight - silica Haematite oj mineral, iron oxide Cannot dissolve iron in water today, it creates rust. In the earlier time, rain erodes the rocks and dissolves the iron because there was very low oxygen. Today we do not have banded iron formation because theres too much oxygen At 2 billion years ago, uraninite and pyrite found in water. But after 1.8 billion, none is found Deserts are red and orangy because rusty Evidence for earlier metazoans Structure in rock is found by creatures biting and digging thru the sediments...
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This note was uploaded on 03/20/2010 for the course EOSC 116 taught by Professor Randell during the Winter '09 term at The University of British Columbia.

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