There are four parallel-sided NW-SE trending faults, Budong-budong, Talondo, Keang and Adang Faults in Mamuju and surrounding area. In Early Tertiary, the faults are dextral fault; however the faults are sinistral fault in the MiocenePliocene tectonics. Karama Basin, situated between Budong-budong and Talondo faults consists of Eocene trangressive sedimentary rocks. It is presumed a step over basin of these faults in Early Tertiary. Keywords: Northwest - southeast faults, Karama basin, Mamuju 
                        
                        
                        
                        
                            
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