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By M. J. Keen and J. A. Jacobs (Auth.)

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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.

T h e break in slope at the edge of the shelf varies in (b) 38 An Introduction to Marine Geology (c) Fig. 3. T h e continental shelf off Nova Scotia (see Fig. 6 for location). Presentation to show the complexity of the topography and the distribution of land and sea as it would appear if sea level were reduced successively. T h e land is white, the sea black (but note that the area beyond the outer black margin is wholly sea), (a) Sea level at the present 30 fm line, (b) 50 fm, (c) 70 fm. T h e Gully of Fig.

Sverdrup, 261 30 M. JohnsonantLR. H. F l e m i n g / ) ) (AfterJ. S. < >). of large tests of the species does not necessarily represent optimal environmental conditions but marginal conditions. This observation has its counterpart in the study of Foraminifera in sediment cores. One criterion for recognition of the change from the warmer conditions of the Pliocene to the colder conditions of the Pleistocene is the change in abundance and size of Globorotalia menardii. They are larger and less 58 An Introduction to Marine Geology Fig.

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