West to east subduction and riftinp on 

 Caroline Ridge coeval with west to east 

 collision at New Guinea. Much magma ex- 

 trusion from rift. 



Obduction of southern ancestral 

 Caroline Ridge over Northern New 

 Guinea begining at 27 m.y. B.P. 

 Progresses from west to east. 



(Approximate scale 1:16,000,000) 



Figure 18. Evolution of the Caroline region: 27-24 m.y. B.P. 



69 



