Note that the "ancestral Caroline Ridge" referred to in the graph- 

 ics is purely hypothetical. It was probably represented by some zone 

 of weakness in the Mesozoic crust (fracture zone; subduction zone; 

 volcanic pile; etc) , but its exact nature is unknown. 



The schematic graphics are self-explanatory, and only the salient 

 time periods in the evolution are noted on the figures. 



66 



