Changes

The faulting pattern suggests that there were two main episodes of extension. The north-northwest-south-southeast-oriented fault set appears to be the oldest and was caused by regional extension of the basin (including basement). Bending at the basin rim probably caused the younger east-west fault set, but regional right-lateral strike-slip motion caused by collision of the South American and Caribbean Plates is superimposed on the younger fault set. The large structural low on the south side of the main east-west fault provides evidence of right-lateral shear caused by extensional forces at the fault bend ([[:File:Methods14ch08f14.jpg|Figure 14]]). Several of the small normal faults appear to have been displaced by left-lateral shear, but this apparent displacement is misleading because the dip-slip movement is much greater than the strike-slip motion.

The faulting pattern suggests that there were two main episodes of extension. The north-northwest-south-southeast-oriented fault set appears to be the oldest and was caused by regional extension of the basin (including basement). Bending at the basin rim probably caused the younger east-west fault set, but regional right-lateral strike-slip motion caused by collision of the South American and Caribbean Plates is superimposed on the younger fault set. The large structural low on the south side of the main east-west fault provides evidence of right-lateral shear caused by extensional forces at the fault bend ([[:File:Methods14ch08f14.jpg|Figure 14]]). Several of the small normal faults appear to have been displaced by left-lateral shear, but this apparent displacement is misleading because the dip-slip movement is much greater than the strike-slip motion.

==References==

==References==