By M. J. Keen and J. A. Jacobs (Auth.)
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Extra resources for An Introduction to Marine Geology
Off river mouths, for example, the distribution of large living foraminiferal populations coincides with very rapid detrital deposition, so that large "standing crops" of Foraminifera are diluted by sediments after burial. Consequently the record preserved in rocks which are the end product, appears sparse in fauna, and the living conditions will be thought to have been marginal. A second empirical approach is to try to relate the present distribution of skeletal remains of planktonic organisms at the surface of sediments to the distribution of water masses, and such a relationship is found ( 2 2 3) among some Foraminifera in the North Atlantic Ocean; they show a dependence upon the temperature of the water in which they live, and this dependence becomes significant when one is interested in the sequence of planktonic faunas (as represented now by the skeletal remains) found in the sedimentary sequence of a sediment core.
S. Manchester). An Introduction to Marine Geology 46 flat, with gradients of less than 1:1000. Two off western Europe are shown in Fig. 1, and a contour map of the central part of the western margin of the Iberian plain in Fig. 4. Their flatness has been ascribed to sediments originating on adjacent topographic rises and spread by "turbidity currents" across the floor. Adjacent abyssal plains may be separated by sills, and an excellent example of this phenomenon, where the sill has been cut by an interplain channel so that the two plains are linked, is Theta Gap, west of the northern part of the Iberian Peninsula.
Unfortunately zero differences between calculated and observed anomalies do not mean necessarily that the model assumed is correct. Acceleration is expressed as centimetres per second per second; it is 2 2 convenient to use the gal, l-0cm/s ; hence one milligal, 0-001 cm/s , is approximately one-millionth of the acceleration due to gravity on the surface of the earth, and we shall see that we require measurements at sea to be precise to within one or two milligals. Measurement The absolute value of the acceleration due to gravity g, is hard to measure.