GEOL 1001 Chapter : Chapter 12
Document Summary
Into dry basins: beds being deposited, topset-coarsest beds (sand and silt, foreset- finer sands and silt, bottomset- finest beds; silts and clay. Steam classification: consequent stream- pattern a function of the land slope, subsequent- pattern modified by faulting, folding, uplift, antecedent- no changes through faulting, folding, uplift, superposed stream- let down onto differently oriented strata. Ions and organic material: water volume, surface runoff, groundwater seepage, permanent streams- constant groundwater seepage. Intermittent streams- seasonally dry: discharge- water past a point per unit time m3/sec, discharge (q)= width (w) x depth (d) x velocity (v) q=wdv, used in water resources planning, used for floor control, used to estimate erosion rates. Inside a bend sediment deposition: cross bedding sand sized sediments, erosion- outside of bend. Mississippi river: sediment deposition dominates over oceanic effects, forms a series of sediment lobes, total expression like a bird"s foot, accumulating sediments sink, due to compaction, due to isostatic pressure, younger lobes accumulate on older lobes through time.
