The core of the Rössing-SJ Dome has been variously assigned to either the 1-2 billion year old Abbabis Metamorphic Complex or the Etusis Formation of the Damara cover sequence. In this work, rocks within the Dome have been remapped and a new stratigraphy and structural history is presented. When this is compared to the Abbabis Metamorphic Complex it is concluded that the core of the Rössing-SJ Dome is not Abbabis Metamorphic Complex but Damaran Etusis Formation. An intraformational upper amphibolite facies (and therefore mid-crustal) extensional ductile shear zone (the Rössing-SJ Shear Zone) has been recognised: it stretches out the stratigraphy within the dome and ramps down the sequence towards the SW where it presumably links with the Khan River Detachment along the basement-cover contact.