GEOL 210 Lecture Notes - Intertidal Zone, Stromatolite, Geologic Time Scale

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Geol 210 sept 9th lec 3. Step of dinosaurs from land to water couldn"t be accomplished before oxygen forming. *intertidal zones: because of the moon. +oxygen rich atmosphere = plants growing faster. Summary: intertidal zones stromatolites o2. Ozone layer gets created ozone layer formed filters uv which allows more complex life to exist. This winter: ozone layer thinning, not doing that well (but better for a few years) Oxygen = 21% of the atmosphere. Key principles: superposition, original horizontality, cross cutting relation, Physics and chemistry assumed to work the same way as today in the past. T got warmer, then ice started melting crust starting moving upward (slowly moves up at geologic time) Each bed is older than the one above and younger than the one below. Applies to other surface such as lava flows or volcanic ahs. Eg: layers in the grand canyon : ones on top are younger. Layers of sediments are deposited in a horizontal layer.

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