One of the mysteries of the English language finally explained.
1Containing iron oxides or rust.‘a band of ferruginous limestone’
- ‘Tectonic ironstone encompasses siliceous and ferruginous rock types that are characterized by the presence of chert or cherty quartzite, iron sulphides and their alteration products.’
- ‘An upwards change in palaeosol type from gley to ferruginous within the Ketch Member has been cited as evidence for improving drainage through Late Westphalian time as a result of tectonic uplift.’
- ‘The rock is cemented by a mixture of quartz overgrowths, K-rich feldspar, and an oxidized ferruginous clay now dominated by chlorite.’
- ‘In the case of more intense Fe impregnation, scattered quartz clasts supported by a ferruginous matrix may be the only remains of former sandstone.’
- ‘The lenses are separated by locally discordant horizons of ferruginous, silicic or graphitic, strongly schistose sedimentary to volcanic rocks.’
- 1.1 Reddish brown; rust-colored.‘the ferruginous earth of southern Brazil’
- ‘A mixture of bruised arum leaves and stalks with a quantity of dark, ferruginous earth and water was put into the gourd.’
- ‘The beige-to-ochre tropical ferruginous soil displays in its first horizons a sandy texture at slope bottom, and is sandy-clayey on the remainder.’
- ‘The latter, a series of ferruginous shelly sands, are the only preserved in situ product of the late Miocene-early Pliocene marine transgression.’
Mid 17th century: from Latin ferrugo, ferrugin- ‘rust, dark red’ (from ferrum ‘iron’) + -ous.
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