Ch. 6 notes students - Ch. 6: Sedimentary Rocks The...

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Ch. 6: Sedimentary Rocks – The Archives of Earth History Key words Sedimentary Rock Properties - Color: red – land; green – marine (exceptions!) - Detrital rocks: shale, sandstone, conglomerate <<round -> indicate that you found in sea/stream/river>>, breccias<<angular indicate you found in glacial environment>>… o Texture: Grain size Transport and deposition (energy) Sorting and rounding Depositional environment/process - Chemical rocks: calcite, rock salt and gypsum << -> show evaporation >>, coal… < Tell is smth about deposition. Coal form from plant material > - Sedimentary Structures (form at time of deposition or shortly after) o Stratification / bedding: layer(sometimes thicker (beds)/thinner(laminations) o Graded bedding: the coal material at the bottom top bottom Upward decrease in particle size Turbidity currents, stream channels o Cross-bedding Layers deposited at an angle Transport by wind or water paleocurrents o Ripple marks Asymmetrical Current or wave formed 1
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This note was uploaded on 03/27/2012 for the course GEOL 2413 taught by Professor Moody during the Spring '10 term at Texas A&M University, Corpus Christi.

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Ch. 6 notes students - Ch. 6: Sedimentary Rocks The...

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