Figure 5-8 Schematic Illustration (from Hey, 1977) of the pattern of 

 Isochronous seafloor resulting from a southward propagating 

 rift. Double lines represent active spreading centers, 

 dashed lines are fossil spreading centers, heavy line is 

 active transform fault, and dotted lines are associated 

 fracture zones. Diagonal trend lines indicate the so-called 

 "propagator wake". 



