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River ValleyDamara OrogenLate ProterozoicSouthern AfricaEarly Middle MioceneTwo NewCranial AppendagesAfricaNile CrocodileSquamate ReptilesMiocene StrataUpper MolarGeological SurveyCalcareous ConcretionsDiamond PlacerIsotope CharacteristicsLocalityLaboratory PreparationPedogenic FeaturesCrocodylus Niloticus