All Words Glossary

Glossary of Geology Terms
beginning with letter O
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oil field Tweet Definition of oil field Like Definition of oil field on Facebook
noun
  1. An area under which are reserves of petroleum; especially one with productive oil wells
oil sand Tweet Definition of oil sand Like Definition of oil sand on Facebook
noun
  1. (geology) a relatively loose sandstone, or porous carbonate rock, impregnated with bitumen
oil shale Tweet Definition of oil shale Like Definition of oil shale on Facebook
noun
  1. a dark-brown or black shale, from which petroleum-like hydrocarbons can be produced by distillation
Oligocene Tweet Definition of Oligocene Like Definition of Oligocene on Facebook
proper noun
  1. (geology) The Oligocene epoch.
adjective
  1. (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.
oolite Tweet Definition of oolite Like Definition of oolite on Facebook
noun
  1. (context, geology, uncountable) A rock of spherical grains within a mineral cortex accreted around a nucleus, often of quartz grains
  2. (context, rare, countable) An ooid or oolith
ooze Tweet Definition of ooze Like Definition of ooze on Facebook
noun
  1. secretion, Secretion, humour.
  2. A thick often unpleasant liquid; muck.
verb (oozes, oozing, oozed)
  1. (intransitive) To secrete or slowly leak.
  2. (intransitive) To give off a sense of (something).
ophiolite Tweet Definition of ophiolite Like Definition of ophiolite on Facebook
noun (wikipedia, ophiolites)
  1. (geology) an assemblage of mafic and ultramafic rock fragments of the ocean lithosphere that has been tectonically moved onto a continental margin or island
Ordovician Tweet Definition of Ordovician Like Definition of Ordovician on Facebook
proper noun
  1. (geology) The Ordovician period.
adjective
  1. (geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago.
orogeny Tweet Definition of orogeny Like Definition of orogeny on Facebook
noun (orogen, ies)
  1. (geology) the process of mountain building by the upward folding of the Earth's crust
OS Tweet Definition of OS Like Definition of OS on Facebook
initialism
  1. Ordnance Survey
  2. operating system
  3. oculus sinister () - left eye
  4. outsize
outcrop Tweet Definition of outcrop Like Definition of outcrop on Facebook
noun
  1. A piece of land that stands out (usually into water) from the land surrounding.
  2. A coming out of bedrock or of an unconsolidated deposit to the surface of the ground.
  3. The part of a rock formation that appears at the surface of the ground.
outlier Tweet Definition of outlier Like Definition of outlier on Facebook
noun
  1. A person or thing away from others or outside its proper place.
  2. (geology) A part of a formation separated from the rest of the formation by erosion.
  3. (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.
outwash Tweet Definition of outwash Like Definition of outwash on Facebook
noun
  1. (geology) The sediment (mostly sand and gravel) deposited by water flowing from a melting glacier

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