ENVR 202 Lecture Notes - Kolmogorov Space, Sedimentary Structures, Chert
10 Mar 2013
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Readings: ch11 pg 16and22, 26-30, 33, 102-103. Clues in rocks, evidence of life, look for conditions which enable life, narrow down certain types of rocks. Rock records!: igneous (cooling from liquid magma, extrusive volcanic, intrusive), sedimentary, metamorphic (heat and pressure applied, sedimentary rocks. Form from ions dissolved in h2o, or fragments eroded from earlier rocks. Also wind: magma crystallization = igneous intrusive, consolidation = igneous extrusive, ingneous intrusive . We can see the action of water, like ripples or dunes, on the surface of rocks related to direction that water was moving or wind. Cracks mud getting wet and then drying. In deeper ocean basins, sediment accumulates as fine mud that is compacted to shale. Submarine slumps (slides) may happen, laying down graded beds: settle in a patterns: graded bed: coarser grains on bottom, grain size getting smaller upwards, short events, tell us about ancient envr.
