EESA06H3 Final: EESA06 Final Notes (Chapter 8-10)
23 Jul 2018
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Lecture 8 deep time/ geologic time- 4. 5 billion years ago. In the last 20 years that we"ve developed relatively inexpensive methods that can be readily duplicated around the world for age dating rocks. absolute age= real age. Relative age dating - well based on mapping in the field, mapping of rock layers, this rock layer is older than this other rock layer. strata- layers of rock. Stratigraphy- the sub-discipline of geology which is concerned with age of rocks. study of how all those rocks are arranged in time as revealed by strata. Accommodation- in order to get rocks preserved, areas of the crust must subside (ocean basins, subduction zones, other types of basins) that way it usually floods with water and accumulate sediment. Basins- the crust to be sinking over broad areas or subsidence. Uplift- opposite of subsidence, results in non-accommodation erosion and removal of sediment and rock, tectonics.
