PDR RECORDS FROM CONTINENTAL SLOPE AND BLAKE PLATEAU
The positions of all echo-sounding records are shown in Plate 30. Depth in fathoms.
- Figure 1. West of the Crest of the Outer Ridge
- Figure 2. Western Side of Outer Ridge near Abyssal Plain
- Figure 3. Blake-Bahama Abyssal Plain
PDR RECORDS FROM OUTER RIDGE EAST OF THE BLAKE PLATEAU AND FROM THE BLAKE-BAHAMA ABYSSAL PLAIN
Depth in fathoms: The outgoing "pings" as well as "scattering layers" are recorded in the 0-400 fathom scale range; the bottom topography may lie within the range of any multiple of 400 fathoms. The depth scales indicated on the plates refer to the profiles of bottom topography. For example—Figure 1 of Plate 5 shows a 300 fathom deep "scattering layer" over which the bottom profile has been superimposed.
PDR RECORD OF OUTER RIDGE SHOWING SUB-BOTTOM HORIZON
One 3 millisecond ping was transmitted and received once each second. Depth in fathoms.