. "Oncoid-ironstone"@en . "stable"@en . . "FEONC"@en . . . "Oncoid-ironstone - A type of ironstone composed dominantly of oncoids. British Geological Survey Research Report RR/99/03, section 5.2, table 15 and fig. 9. Synonym: iron-oncolite."@en . "Oncoid-ironstone"@en .