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| two factors that influence the porosity of a sedimentary rock |
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| the two parts of a tidal flat that lie below the low-tide elavation AND between the low-tide elavation and the high-tide elavation |
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| the two parts of a tidal flat that lie between the low-tide elavation and the high-tide elavation AND above the high-tide elavation |
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| the line of deepest water in a channel |
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| a deposit that consists mainly of cross-laminated sand in sets 2-4cm thick but with concave up 1-2mm thick, discontinuous layers of mud |
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| two different parameters that describe the shape of sediment grains |
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| flat grains (blades or discs) that lie propped on each other, with their flat surface dipping up-current are said to be: |
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| the ideal vertical succession produced by turbidity currents , containing subdivisions A-E |
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| generated by the lateral migration of the thalweg of a fluvial channel |
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| the law that describes the conceptual linkage between the horizontal arangement of sedimentary enviroments and the vertical stacking of the resulting deposits in a rock succession |
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| a bedform in which a set of laminae that is 25cm thick, within which the laminae dip at 30 degrees |
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| cause a series of current ripples to migrate forward and climb |
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| Hummocky Cross Stratification |
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| a set of laminae that contains gentle undulations (dip < 10 degrees) regardless of which directin the set is sectioned |
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| the most important process that transports sediment into deep water basins |
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| the finest grain size AND the approximate minumum current speed in which subaqueous dunes can form (in water depth of 1m) |
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| two properties of a grain that determine its settling velocity |
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| two properties of rock fragments and mineral grains that influence their resistance to physical breakdown during transport in a river |
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| grains that take short hopes that are less than 5 grain diameters high are said to be moving by: |
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| the coarsest grain size and the approximate maximum current speed in which current generated ripples can form |
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| a current is slowing down. such a current deposits sediment because the _____ of the current is decreasing AND the deposits that are formed become finer upwards because the ______ of the current is also decreasing |
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| two rock types that are NOT likely to occur in a conglomerate that was formed by long distance transport of clasts |
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| two rock types that ARE likely to occur in a conglomerate that was formed by long distance transport of clasts |
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| areas that are termed "mesotidel" have a tidal range of: |
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| the wentworth-scale names of the two grain sizes that lie between 0.0625mm and 0.25mm |
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