The Yerila gneissic complex forms a 14 km on 4 km surface of discontinuous outcrops. The area is not named on topographic maps but includes the Mt Babbage (Eastern part), Birthday Well (South) and Pigeon Spring (North). The closest main stations are Mt Fitton and Moolawatana. The Mt Yerila, located 14 km to the North should not be confused with it.
The Yerila gneiss (1555 Ma) is generally showing large laths of oriented microcline, large allanite patches, biotite, oligoclase and contains alkaline amphiboles. The rock has a metasomatic origin and represents the high-level plume of the nearby rapakivi Terrapinna Granite (1560 Ma). The pre-metasomatic rock was of volcanic (rhyolites, tuffs, etc.) and of sedimentary origin (sandstones, carbonates). The rock is extremely rich in rare earth elements (up to a few percents), uranium, thorium and fluorine.
The complex is crosscut by amphibolite dikes (~800 Ma) and intruded by a 3 x 6 km Palaeozoic tonalite and numerous granitic pegmatites.
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Map Reference: 29°53'36"S , 139°32'16"E
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Mineral List:24 entries listed. 23 valid minerals.
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