Georges Bank is the westernmost of the important series of fishing grounds reaching from the southern New England coast past Nova Scotia to the Grand Banks of Newfoundland. During the summers of 1930 and 1932 the United States Coast and Geodetic Survey re-charted this bank for the benefit of the fishing industry. Sonic methods were used, which permitted numerous, closely spaced soundings. During the course of the survey, many gorges were found cutting the southern edge of the bank, which here is coincident with the edge of the continent. A few of these gorges had been indicated in a general way on the older charts, but this last survey was detailed enough to give for the first time their true configuration, as well as bring to light many others whose existence previously had not been suspected. In general, they are cut back into the continental shelf from 5 to . . .