Peripheral Units
Several fold and thrust belts and sedimentary basins are peripheral, and potentially related, to the Gascoyne Complex.
Between approximately 2000-1800 Ma, on the northern margin of the Yilgarn Craton, the c. 1890 Ma Narracoota Volcanics of the Bryah Basin formed in a transverse back-arc rift sag basin during collision. Culmination of the cratonic collision resulted in the foreland sedimentary Padbury Basin. To the east the Yerrida and Earaheedy Basins were passive margins along the Yilgarn's northern margin. The c. 1830 Ma phase of the Capricorn Orogeny resulted in northeast-southwest deformation of the Bryah-Padbury Basin with flood basalts in the Yerrida Basin.
The Gascoyne Complex rocks, namely the Yarlarweelor Gneiss are thrust eastward onto the upper rock units of the Bryah Basin and the whole succession of the Padbury Basin. The Yerrida Basin was affected by this wast-west compression adjacent to the Goodin Fault. This event is incongruous with the c. 1830 Ma Capricorn Orogeny, is strike-slip to oblique-slip in nature and is most likely the Mangaroon Orogeny.
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