DIRECTORATE OF SCIENTIFIC INFORMATION SERVICES OTTAWA (ONTARIO)
The Nares Abyssal Plain is bounded by the Bermuda Plateau, a zone of abyssal hills adjacent to the Mid Atlantic Ridge, and the Outer Ridge. To the west it joins with the Vema Trough and the Hatteras Abyssal Plain. Its area, according to Heczens calculations, is 37,000 square miles. In the middle of 1962 a Soviet expedition on the Petr Lebedev carried out an area survey crossed-run survey of one region in the southern part of the Nares Plain. Within this area of 2000 square miles 20 sounding runs were made, separated by distances of 8-10 miles and of total length about 500 miles. From the survey data, echo profiles and a bathymetric chart Fig. 1 were compiled. Examination of the chart and other data shows that the surveyed region lies at depths greater than 5800 m, and is characterized by a generally flat relief. A very feeble north-tosouth rise of the bottom is observed. Over a distance of 30 miles the depths vary by 25 m in the mean from 5835 to 5810.
Trans. of Akademiya Nauk SSSR. Doklady, 1963, v. 148, no. 6, p. 1392-1393. Also available from NRC as C-4725.