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REPORT OF 'ads CO~,1~T~EE ON SEDI'7:E~3TON POR 1939-1940 Contents Report of the Chairman - Parker D. Trask 1 Supplementary reports, presented as Exhibits. Exhibits: a, A proposed compilation of size data of sediments' by W. C. ~ mlbein ~ ~ ~ ~ ~ · e ~ e · ~ · ~ ~ ~ ~ · e · ~ ~ ~ ~ ~ e · · B. Mineralogy of sedimentary rocks, 1937-1939, by F. J. Pett~john .~. e e ~ · e ~ ~ e ~ ~ ~ ~ ~ e ~ ~ · ~ ~ · Page 6 .. 22 C. Progress in hydraulics as related to sedimentation' 1939-1940, by Lorenz G. Straub . ~. 70 D. Bibliography on pediments and related sediments, by Charles B. Shut e ee ~ ~ .. e. ~ .~e ~ ~ ~ ~ .~e ~ ~ ~ ~ ~86 E. Sed=uentat~on Studies by the Soil Conservation Ser vice, 1939-1910, by Carl B. Brows ............ 89 :?, Curves for determining probable errors in heavy mineral sedges, by Gordon :Rittenhouse 97 G. The importance of heavy mineral analysis for regional sedimentary petrology, by D. J. Douglas 102
