deposito di benua timur
Asia
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Afrika
Uganda
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Eropah
Germany, Hungary, Italy, Spain
Bulgaria
lain
tanah penggembalaan, mid-Atlantik ridge
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deposito di benua Barat
Amerika Utara
USA
USA
Amerika Selatan
Bolivia, Brazil
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deposito di oceania benua
Australia
New South Wales, New Zealand, Queensland, South Australia, Western Australia
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