. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 760 HEEZEN [chap. 27 the heads of submarine canyons by Shepard (1948), Zenkovich (1958), Heezen (1956) and others. It was found that cable faihu'es in the submarine canyon of the Magdalena (Heezen, 1956) occurred after prominent changes had taken place in the depth and shape of the river mouth (Fig. 13). These changes in turn had occurred only during the highest flood stages of the river. A similar pattern was also observed off the Congo. Both rivers have a common characteristic in their lack JQdl^th ' 4100 MejEi]i= 2Z^o F
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 760 HEEZEN [chap. 27 the heads of submarine canyons by Shepard (1948), Zenkovich (1958), Heezen (1956) and others. It was found that cable faihu'es in the submarine canyon of the Magdalena (Heezen, 1956) occurred after prominent changes had taken place in the depth and shape of the river mouth (Fig. 13). These changes in turn had occurred only during the highest flood stages of the river. A similar pattern was also observed off the Congo. Both rivers have a common characteristic in their lack JQdl^th ' 4100 MejEi]i= 2Z^o F^TNO/fS /S'4o'^ Laf l^"/5'Wlona Colombian /ibtisso/ P/o/// METEJ\S 0 D/im T/)M romn lutite LIGHT T/iAl FOf^nM LUTIT£ Dam T/fM rOWM Il/TITB Snti cnunbLy ^usty lutite Dim GMr LUJ/T€ 5eCONING HCHTCfi^ ct^tEfiiSH nuLow eowywji/io with M/i£aH5 or mr Slhch /i/c/icioui :jilt ^UMfflOOS I0-/5C/-} LUJIJE LHYE/^S /// VDHious ^-Ha PCS or oMr- aXf£\/i// cifiY ifl//ir Sl/ich s^/iD in 6 layiHS (^^ V/imiNG COHHSCNtSS { iy£LL SOffTED S/}/iP VEHY P'lHIi Oflir SILT. JIuNCDTCn cnoss j>iDDiAiO 1 v/in sofiTio vtiL ftDoeo OffiiK cmi snuo cri/>r GfiilNisH offPY lurnc uicll ^oJficD DDRii c/rni nicgcfous sumo AO BC DOIfiC Yg^iiicfniu G'iDr rof^HM mrne IV0 PL HUT J}£3/115 zo'A ^ica -v Mno, on,' FLfi/nr /M3/r/s 407, 3/)fiJJ • Pl/^IVT DSBfilS. OOZ S/I/VD •' PiUA/r //SBfits JO % FIAIf Sa/YO //O Fl fi/YT D£Bfl/i TnnC£ 3/iNP •' PL a/YT pesflis 20?^ saiYD •. /V/r/? J^-/O?o Pl/t/YT £>£ 3/^15 WtLL somero Fint Si^fYP -,50% /^/C/l. /VOCH PL/INT J/i6/ilS )30l PlHnT Df3/f/5 /YO PI HfYT JJCB^/S / z-~ J- 4— 5- 6- loqqfftl L>u flavid 3 Ericzon^ Inn/on/ 6eola(7/i^j/ Ohierya/ory Fig. 15. Log of core A179-3 from the Colombia Abyssal Plain. Sediment in this core presumably caine from the month of the Magdalena River through the action of turbidity currents, which carried this sediment nearly all the way across the Colombia Basin. Note that many of the beds contain up to 90°o of plant
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
