. The Earth beneath the sea : History . 50 100 150 200 250 300 Distance from (00:59) break measured along deepest portion of bight 350 Fig. 3. Time-distance graph of the 1929 Grand Banks turbidity current. (After Heezen and Ewing, 1952.) _ /^--:i area. The current travelled down and across the continental slope, continental rise and ocean basin floor, and, continuing far out onto the abyssal plain, reached a limit well over 450 miles from its source area on the continental slope (Fig. 2). On the continental slope where the bottom gradient is 1:10 to 1:30 the velocity of the current exceeded 50
. The Earth beneath the sea : History . 50 100 150 200 250 300 Distance from (00:59) break measured along deepest portion of bight 350 Fig. 3. Time-distance graph of the 1929 Grand Banks turbidity current. (After Heezen and Ewing, 1952.) _ /^--:i area. The current travelled down and across the continental slope, continental rise and ocean basin floor, and, continuing far out onto the abyssal plain, reached a limit well over 450 miles from its source area on the continental slope (Fig. 2). On the continental slope where the bottom gradient is 1:10 to 1:30 the velocity of the current exceeded 50 knots; and out on the abyssal plain where the gradient is less than 1: 1500 its velocity, although diminished, still exceeded 12 knots (Fig. 3). Subsequent exploration of the area with the piston corer revealed a one-meter thick, uppermost bed of graded silt containing shallow- water microfossils (Heezen, Ericson and Ewing, 1954) overlaying abyssal lutite
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
