| oil field |
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noun - An area under which are reserves of petroleum; especially one with productive oil wells
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| oil sand |
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noun - (geology) a relatively loose sandstone, or porous carbonate rock, impregnated with bitumen
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| oil shale |
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noun
- a dark-brown or black shale, from which petroleum-like hydrocarbons can be produced by distillation
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| Oligocene |
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proper noun - (geology) The Oligocene epoch.
adjective - (geology) Of a geologic epoch within the Paleogene period from about 34 to 23 million years ago; marked by the rapid evolution in a warm climate.
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| oolite |
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noun - (context, geology, uncountable) A rock of spherical grains within a mineral cortex accreted around a nucleus, often of quartz grains
- (context, rare, countable) An ooid or oolith
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| ooze |
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noun
- secretion, Secretion, humour.
- A thick often unpleasant liquid; muck.
verb (oozes, oozing, oozed)
- (intransitive) To secrete or slowly leak.
- (intransitive) To give off a sense of (something).
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| ophiolite |
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noun (wikipedia, ophiolites)
- (geology) an assemblage of mafic and ultramafic rock fragments of the ocean lithosphere that has been tectonically moved onto a continental margin or island
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| Ordovician |
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proper noun
- (geology) The Ordovician period.
adjective
- (geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago.
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| orogeny |
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noun (orogen, ies)
- (geology) the process of mountain building by the upward folding of the Earth's crust
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| OS |
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initialism
- Ordnance Survey
- operating system
- oculus sinister () - left eye
- outsize
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| outcrop |
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noun
- A piece of land that stands out (usually into water) from the land surrounding.
- A coming out of bedrock or of an unconsolidated deposit to the surface of the ground.
- The part of a rock formation that appears at the surface of the ground.
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| outlier |
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noun
- A person or thing away from others or outside its proper place.
- (geology) A part of a formation separated from the rest of the formation by erosion.
- (statistics) A value in a statistical sample which does not fit a pattern that describes most other data points; specifically, a value that lies 1.5 IQR beyond the upper or lower quartile.
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| outwash |
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noun - (geology) The sediment (mostly sand and gravel) deposited by water flowing from a melting glacier
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