. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. rP • 200--** • ^Mackenzie. 76° 150° 145 140° 135° 130° 125° Fig. 22. Median diameter, expressed in microns, of sediments on shelf and slope in Beaufort and north-east Chukchi Seas. Contours in fathoms. (From Carsola, 1954, fig. 4.) of big sedimentary supplies owing to the retreat of shorelines after the post- glacial transgression. The reduction in grain size from outer to inner shelves may also be due to a general reduction in river competence, and thus have a climatic significance. The low rates in terrigenous sedimentat
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. rP • 200--** • ^Mackenzie. 76° 150° 145 140° 135° 130° 125° Fig. 22. Median diameter, expressed in microns, of sediments on shelf and slope in Beaufort and north-east Chukchi Seas. Contours in fathoms. (From Carsola, 1954, fig. 4.) of big sedimentary supplies owing to the retreat of shorelines after the post- glacial transgression. The reduction in grain size from outer to inner shelves may also be due to a general reduction in river competence, and thus have a climatic significance. The low rates in terrigenous sedimentation may have prevailed for a much longer time off arid or semi-arid regions, where river discharge, although it was increased during pluvial Pleistocene periods, was not able to compete with more humid climates. This is probably the case for the continental shelf of Western Austraha (Carrigy and Fairbridge, 1954), and the Persian Gulf (Emery, 1956; Houbolt, 1957), where the hot dry chmate results in slow accumulation, relative abundance of organogenic calcareous deposition, and dominance of silt and clay in the non-calcareous fraction, partly contributed by wind Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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