SECT. 3] 



TURBIDITY CURRENTS 



767 



W/^ir^M COLD 



/V>7/?/^ COLD 



>7V = ^0% 



Coarje. fraction 



joy. 



- I malar 



-2 



-3 



Fl«x 



\ 



/7Vo-52Vo 



Coatse 

 fraetion 



— Coorsa 

 frac ti'oft 



Th<z, curi^ec/ /inz //id/cafes cl/mat/c 

 varjai/on c/s /nferred from Sjoec/as of 

 planhton/c foram/nifera in samt/os 

 tah<in at /O cm /nf<zrya/s. 



Fig. 20. Log of two cores on the flank of Muir Seamoiint. Note the coarser, thinner layer 

 representing the last cold period in core A 164-44, as compared to the finer thicker 

 section in core A173-4. The thicknesses of the recent warm period and the previous 

 warm period, which correlates with the Globorotalia menardii flexuosa zone, are near 

 the same thickness in both cores. (After Ericson and Heezen, 1959.) 



Mum 5imoi}Hi 



J430rr, « 



Po SSI hie. deap 

 current d/rections 

 durino f/e/uosct 

 inttr^a/ of 

 iv'artn cl/matiz 



F robolola 



daap currant 



directions 



durino last cjlaciation 



|4S0 m! l»r i 



bn. 



mi i?s 



Fig. 21. Location of cores A164-44 and 173-4 on the flank of the Muir Seamount, showing 

 the interpretation of the data presented in Fig. 20. It is presumed that during the 

 present warm period and during the previous period of warm climate, currents flowed 

 northwest, parallel to the seamount. However, during the last glaciation, currents are 

 presumed to have moved from the southwest to northeast, wimaowing material from 

 the top and the flanks of the seamoimt, and depositing the finer material in the lee of 

 the seamount on the northeast flank. This would account for the thick bed of fine 

 sediments representing the last glaciation in core A 173-4 and the thin, winnowed 

 layer in core A 164-44. (After Ericson and Heezen, 1959.) 



