... replaced by magnesian calcite from the same geological formation, north of Coober Pedy, South Australia. Powder X-ray-diffraction analyses show that the opalized bones are composed of opal-AG and quartz. Major- and minor-element XRF analyses show that they are essentially pure SiO 2 (88.59 to 92.69 wt...

...) Palaeoweathering, Palaeosurfaces and Related Continental Deposits . Association of Sedimentologists , Special Publications, 27 , 337 – 366 . Benbow , M.C. , 1982 . Coober Pedy, South Australia, explanatory notes, 1:250 000 geological series, sheet SH/53-6 . Geological Survey of South Australia...

... Mulgathing Complex in the Christie Domain, across the Palaeoproterozoic Mt Woods Complex, Coober Pedy Ridge and Nawa Domain and into the Mesoproterozoic Musgrave Block. Magnetotellurics is a passive electromagnetic technique that utilizes naturally occurring fluctuations in Earth's magnetic field, which...

.... The Tallaringa Palaeodrainage system Quarterly Geological Notes, Geological Survey of South Australia 1976b 59 7 10 Benbow, M. C. 1982. Coober Pedy, South Australia. Explanatory notes. 1:250000 geological series. Sheet SH/53-6. Geological Survey of South Australia. Benbow M. C...

...F ig . 1. Interpreted crystalline basement geology of the Gawler craton, South Australia, showing the location of major mineral deposits and prospects. CPR = Coober Pedy Ridge. Inset shows the location of the Gawler craton in relation to Proterozoic provinces of Australia. R698126 refers...

..., which is not highly visible. The HF etch revealed a central depression in some spheres (arrows). ( b ) Milky white opal from Australia (Coober Pedy mine, South Australia, no. 834) that is typical for Australian opal-AG. The successive concentric layers (mainly three, but up to six) are well defined. ( c...

.... C. , and Scott , 1990 , Geology of the Coober Pedy precious stones field. Results of investigations, 1981–1986 : Geological Survey of South Australia, Report of Investigations , 56 . 1 – 55 . Sander , P. M. , 1988 , A fossil reptile embryo from the Middle Triassic of the Alps...

... Hydrothermal Opal-A 104.258 White White Terrace, New Zealand Hydrothermal 1040 Grayish-yellow Coober Pedy, South Australia, Australia Weathering 1039 Orange MTB01 White Mintabie, South Australia, Australia Weathering MTB02 White BR08 White Brazil Unknown Gi526...

...Figure 8. Field example of the prototype system from Coober Pedy, South Australia. The survey used two end-to-end cables laid out on the ground surface at an electrode spacing of 6 m . The cables were then displaced along the line by 3 m and the recording repeated, thus...

... , The occurrence and formation of opal at Coober Pedy and Andamooka , in Austr. J. Sci ., 29 , 5 , 129 – 133 , 1966 . 2. Darragh , P.J. , A.J. Gaskin , B.C. Terrel , and J.V. Sanders , Origin of precious opal , Nature , 209 , 5018 , 13 – 16...

... ICP-MS in the Earth Sciences: Current Practices and Outstanding Issues . Mineralogical Association of Canada , Vancouver , B.C.: Short Course Series , 40 , 328 – 333 . Jones J.B. Segnit E.R. 1966 . The occurrence and formation of opal at Coober Pedy and Andamooka . Australian...

... the Eumeralla Formation and equivalent beds in the upper Strzelecki Group (= Wonthaggi Formation) establish their presence in eastern Gondwana by middle Cretaceous time (Martin et al . 2008 ). Recent reports of crayfish bio-gastroliths from the Aptian–Albian marine deposits at Coober Pedy (South Australia...

... at the deposit have provided significant additional data on its key characteristics ( Carter et al., 2003 ; Hart and Freeman, 2003 ; Belperio and Freeman, 2004a ). Prominent Hill is located on the Gawler craton, midway between Olympic Dam and Coober Pedy (Fig. 1 ). Outcrop is virtually nonexistent...

... Range No. 3 Bore, Coober Pedy: stratigraphy and micropaleontology : South Australia Dept. Mines Mining Rev. , no. 122 , p. 28 – 32 . Ludbrook , N. H. , 1966 , Cretaceous biostratigraphy of the Great Artesian basin in South Australia : South Australia Geol. Survey Bull. 40 , 223 p...

...-grade rocks ( Betts et al., 2003 ; Schlegel et al., 2018 ). Cairn Hill, dominated by magnetite with minor Cu-Au, is a crucial Fe deposit on the northern boundary of the Olympic Cu-Au province, 55 km southeast of Coober Pedy ( Fig. 1 ; Clark, 2014 ). It is located at the westernmost end...