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The 52-m-thick rhyolitic sill at Onedin, in northwestern Australia, intruded wet, unconsolidated sediment of the Koongie Park Formation during the Palaeoproterozoic. The sill is composed of five main zones. A thin (1-2 m thick) basal peperitic contact zone with sparse large (<1 cm) amygdales and abundant spherulites, grades up over 1 m into the lower zone. The lower zone is 10 m thick and made...
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