OFFICER, C. B., EWING, M., AND WUENSCHEL, P. C., 1952, Seismic refraction measurements in the Atlantic Ocean basin, Part IV, Bermuda, Bermuda Rise, and Nares Basin: Geol. Soc. Am. Bull., v. 63, p. 777-809 OFFICER, C. B., EWING, J. I., EDWARDS, R. S., AND JOHNSON, H. R., 1957, Geophysical investigations in the eastern Caribbean. Venezuelan Basin, Antilles Island Arc, and Puerto Rico Trench: Geol. Soc. Am. Bull., v. 68, p. 359-378 PETTIJOHN, F. J., 1957, Sedimentary rocks: Harpers, New York, 718 p. PRESS, F., AND BECKMANN, W. C., 1954, Geophysical investigations in the emerged and submerged Atlantic coastal plain, Part VIII, Grand Banks and adjacent shelves: Geol. Soc. America Bull., v. 65, p. 299-314 RAISZ, E., 1952, Landforms of the United States: Harvard Univ., Cambridge, Mass. RAITT, R. W., 1956, Seismic-refraction studies of the Pacific Ocean basin, Part I, Crustal thickness of the equatorial Pacific: Geol. Soc. Am. Bull., v. 67, p. 1623-1640 RICHARDS, H. J., AND RUHLE, J. L., 1955, Mollusks from a sediment core from the Hudson submarine canyon: Pa. Acad. Sci. Proc., v. XXIX, p. 186-190 SCHOTT, G., 1942, Geographie des Atlantischen Ozeans: C. Boysen, Hamburg, 438 p. SCHÜLER, F., 1952, On the accuracy of configuration of sea bottom profiles with high frequency echo sounders: Intl. Hydro. Review, v. VII, p. 126-135 SHAND, S. J., 1949, Rocks of the Mid-Atlantic Ridge: Jour. Geol., v. 57, p. 89-92 SHEPARD, F. P., 1931, Saint Lawrence (Cabot Strait) submarine trough: Geol. Soc. Am. Bull., v. 42, p. 853-864 ---- 1948, Submarine geology: Harpers, New York, 348 p. SHEPARD, F. P., AND COHEE, G. V., 1936, Continental shelf sediments off the Mid-Atlantic states, Geol. Soc. Am. Bull., v. 47, p. 441-457 SHEPARD, F. P., TREFFENDEN, J. M., AND COHEE, G. V., 1934, Origin of Georges Bank: Geol. Soc. Am. Bull., v. 45, p. 281-302 SHURBET, G. L., AND WORZEL, J. L., 1957, Gravity anomalies and structure of the West Indies, Part III: Geol. Soc. Am. Bull., v. 68, p. 263-266 SMITH, E. H., SOULE, F. M., AND MOSBY, O., 1937, MARION and GENERAL GREENE expeditions to Davis Strait and Labrador Sea under the direction of the U. S. Coast Guard, 1928-1931-1933-1934-1935: U. S. Coast Guard Bull., v. 19, p. 1-259 SMITH, W. O., UPSON, J. E., and others, 1952, Preliminary report on the Passamaquoddy bedrock survey, July-August 1951: U. S. Geol. Survey Water Resources Division, 49 p. SPANGLER, W. B., 1950, Subsurface geology of Atlantic coastal plain of North Carolina: Amer. Assoc. Petrol. Geol. Bull., v. 34, p. 100-132