Topographie sous-marine de l'"Outer Silver Pit" et du "Markhams Hole" Lat. N.54° Long. E. Gr. 2°

1° the topography of the depression located east of the "Markhams Hole" of the "Fischereikarte der Nordsee" is quite different from that represented on the chart, but the observed depths are the same.2° the depression of the "Markhams Hole" does not exist. Where depths of 60 metres were indicated on the chart we only observed depths of 30 to 35 metres.3° the topography of the "Outer Silver Pit" is extremely complex; there is no doubt that another series of transversal transects would show more peculiar topographic accidents than those observed.However, we think that we have detailed enough this depression's main topographic lines to conclude that its model is mostly a Quaternary model of glacial or periglacial origin. The sedimentological study of the materials collected through dredges and drillings during this cruise will surely add more precisions in this matter.However, one will note that our first observations match perfectly the conclusions drawn by J. Furnestin (1939) (1). In a geological and morphological study focusing on the North Sea and more precisely on Devil's Hole, this author concluded that this area "bears the distinctive mark of a glacier which has slipped from the Firth of Forth through the Devil's Hole and the Fladen trench."