Spheroidal structures, relict microfossils, silica precipitators, United States, Canada, Australia, South Africa
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GeoRef SubjectCanada Australasia Africa Eastern Canada Australia Lake Superior sedimentary rocks Great Lakes Ontario metal ores mineral deposits, genesis Quebec Labrador chemically precipitated rocks iron ores Western Australia economic geology United States North America Swaziland iron formations South Africa Newfoundland Precambrian Southern Africa