W km Outboard toe-thrust Sub-thrust fold belt 1000 2000 3000 4000 5000 X’ km X Z Z’ DANGEROUS GROUNDS RIFTED CRUST? NW Sabah Trough Compressed Fold Belt Thrust Sheet Post-rift Carbonate ? 4000 6000 8000 km Syn-rift clatics? Fold-thrust belt anticline Syn-rift clastics Post-rift carbonate Open