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sept 10 - 5 Thursday 9:30 AM What are some problems when...

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Ecologic time, unless barrier is present o Almost instantaneous o Migration Different environments Easier to correlate in greenhouse times than ice house times bc. In ice house times you have more zones to correlate o Different climatic zones Deserts, oceans that keep organisms from migrating o E.g. isthmus Filter: a passageway to a barrier o Distance and geography What are some problems when you try to correlate data? Example of iterative evolution (repeated evolution in the same line of species) o Repeated extinctions, migrations, and radiations in Ordovician to Cambrian trilobites Founder: Pete Palmer Got wiped out on a bedding plane Series of zones of trilobites Biased fossil record o Organisms interacting in environment; how did organisms function? How did organisms interact with the environment? How did organisms interact with one another? o Soft parts decay -> skeletal remains in the lithosphere -> brought back to surface, exposed o Paleoecology: How did remains get preserved in the fossil record?
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